renntech headers

V8SLK · 11-28-2007

Dan, i'm considering a set of renntech headers but i'd really appreciate your input before i get too serious about it. do you think they are worthwhile? can i expect them to create warranty conflicts? should they be supplemented by a new cat back system, etc?

thanks in advance...

**DansSlk** · 11-28-2007

Totally worth it mod wise but not worth the price they charge but all of the tuners over price these sort of items, you can expect about 20/30 extra horses easy and a quicker revving engine.

Exhaust warranty would be void but the engine warranty wont be effected and RennTech would fork out if you had any issues with the headers themselves.

You could instal some sports cat's if you wanted mate, it all comes down to price at the end of the day i know that camshafts would be on my list before cats if i where in your shoes right now.

Cats are going to give a few horses but from cam's you can expect a boost similar to that given by the headers, the Brabus B55 pack is basically just cam's and they quote 390 so we we take that figure and add 25 bhp for the headers also that puts you at over 400 horsepower.

The manifolds are the most restrictive part of the whole system, my advice would be go for it.

Baron7700 · 11-28-2007

What about the DSM or something another chip Mo, and Mw55 was talking about. 400bhp.

Baron7700 · 11-28-2007

I totally agree with you. Its in another post, and, like you, want to see more and how.

Sigh, wish there was more cost effective stuff for the 350. Its sad knowing all the money you spend on performance for the 350 can just go towards a base 55.

**alroumi** · 11-28-2007

I dont think its 390ish but some tuners over claim the gains that they get, I might be closer to 395hp with Green filters, Ecu update, Kleemann 200 cell primary cats, SuperSprint X pipe.

**DansSlk** · 11-28-2007

Quote:

Originally Posted by alroumi

I dont think its 390ish but some tuners over claim the gains that they get, I might be closer to 395hp with Green filters, Ecu update, Kleemann 200 cell primary cats, SuperSprint X pipe.

Who was that one in response to mate?

If we are talking about the chip now then i totally 100% agree you need hardware mods to gain real power.

Is its about the B55 I've seen them on dyno's at almost 400 horsepower.

That mostly comes from the cams but they also fit sports cats and platinum spark plugs and require less power to produce a good spark and when that spark is generated its of a higher quality than OEM.

**alroumi** · 11-28-2007

Quote:

Originally Posted by DansSlk

Who was that one in response to mate?

If we are talking about the chip now then i totally 100% agree you need hardware mods to gain real power.

Is its about the B55 I've seen them on dyno's at almost 400 horsepower.

That mostly comes from the cams but they also fit sports cats and platinum spark plugs and require less power to produce a good spark and when that spark is generated its of a higher quality than OEM.

Its to do with the DMS chip, Mjawa55 just got on his car.

I've got the Digi-tec ecu which claim a modest 20hp over stock.

I think can be obtainable with 100 octane since I am using a higher octane grade in comparison to Renntech for example say if they are using 91 octane for there ecu upgrade.

I dont really care if its 10 or 20hp but atleast that I gain additional horsepower and torque at the end of the day. I am very satisfied with my gains after the numerous upgrades, looking forward for a set of Headers this summer as a birthday present hopefully to break the 405-410hp barrier.

V8SLK · 11-28-2007

i just spoke to a good friend of mine who owns an indy shop in town. he said he'd do the install...

hhhhhhhhhmmmmmmmmm...

ok, now i'm about 99% sure that i'll be doing it.

VitaminT · 11-29-2007

Why not the supersprints? I think if I was going to get headers I would get the long tubes but that's just me. I guess they won't bolt to stock cats like the renntechs but to me the Renntech looks pretty close to stock for what???$5k.

On the ECU tune note. I am not sure if it was the day, or my car or what but when I did my dyno pulls this past summer it was extremely rich. Like 9.5 or 10.0:1. If they all are like that, I can see about 20whp gained with a good tune.

GregoryGR · 11-29-2007

Quote:

Originally Posted by V8SLK

i just spoke to a good friend of mine who owns an indy shop in town. he said he'd do the install...

hhhhhhhhhmmmmmmmmm...

ok, now i'm about 99% sure that i'll be doing it.

Go for it!!

if reliability remains in the same levels, do it! I m planning myself to get Kleemann headers and cats.

**alroumi** · 11-29-2007

I intened to get headers soon possibly renntech or kleemann because they can clamp on the existing kleemann cats that are on my car.

**FishtailnZ** · 11-29-2007

Quote:

Originally Posted by VitaminT

Why not the supersprints? I think if I was going to get headers I would get the long tubes but that's just me. I guess they won't bolt to stock cats like the renntechs but to me the Renntech looks pretty close to stock for what???$5k.

On the ECU tune note. I am not sure if it was the day, or my car or what but when I did my dyno pulls this past summer it was extremely rich. Like 9.5 or 10.0:1. If they all are like that, I can see about 20whp gained with a good tune.

The Supersprint long tubes would allow higher hp gains than any shorty for sure, but some jurisidictions that combine visible inspections as part of emissions testing would fail a car on the spot for long tubes, as they move the cats away from the stock location. Shorties, while making less power, are emissions friendlier in that they don't relocate the cats.

Interesting are your A/F results on the dyno - mine too was PIG rich in the higher rpm ranges, approaching 10:1 at 6 grand. That is definitely robbing some power, no doubt.

**FishtailnZ** · 11-29-2007

I noticed the same thing when I had a good look at the setup (while putting in the Greens) a couple months back Bill. No doubt a larger volume airbox would help some, but the price for the Renntech piece is just silly. If someone came up with a similar design, forego the carbon fibre, and priced it aggressively I think it would sell well. As a whole, the M113 engine seems pretty restricted on both the intake side and exhaust.

**DansSlk** · 11-29-2007

Totally agree the stock airbox is restrictive and so are the stock manifolds.

We need somebody with a Renntech box to let us take a mold of it then we can knock out as many as we need in plastic.

Slightly harder to copy the headers tho but still nowhere near impossible.

Those ratio's do seem higher than what i have seen on them over here.

V8SLK · 11-29-2007

Quote:

Originally Posted by VitaminT

Why not the supersprints? I think if I was going to get headers I would get the long tubes but that's just me. I guess they won't bolt to stock cats like the renntechs but to me the Renntech looks pretty close to stock for what???$5k.

.

i've chose renntech for a few reasons.

1. the company's founder and president helped develop AMG engines in Germany before Mercedes appointed him Technical Director of AMG North America, this gives me confidence in the company and products.

2. the company will cover any warranty issues that the headers may void.

3. renntech is tried and true.

4. Bill is giving me a smoking hot deal (the best that renntech will allow) add that with the fact i won't have to pay sales tax and i'll save close to $1,000 off of prices i've gotten locally.

5. it's a bolt-on application and does not reqiuire any other modifications.

6. they will pass California's emission inspection.

i have nothing negative to say about SuperSprint, but the positives that Renntech offers are worth the few extra $$$.

**DansSlk** · 11-29-2007

I have a fixed number of good idea's per year mate and i have to be careful not to use them all at once.

**dsb** · 11-30-2007

Quote:

Originally Posted by Bill T

I do not think the rich condition is 100% due to the OEM ECU calibration.

I had done a few dyno runs with my car

Was seeing similar A/F ratios on 2 different configurations

Stock Airbox and filters
Stock Airbox and Green Filters (Better but not much)

When I did a dyno run with a RENNtech Airbox and Green Filters the A/F was high 11's to low 12's at 6000 RPM

The stock air box is restrictive. if you have a look at the clearance above the air filter there is next to none at one end of the air filter. The RENNtech box adds 1 inch more clearance at the front of the filter and more over all air volume. The question is whether or not its worth the cost of the airbox.

Just my thoughts on the subject

I too think the Renntech airbox is overpriced. We MB owners get raped.

I recall someone modifying the stock airbox on a C55. When you open it up, you'll see ribs (for lack of a better term). They cut them out thinking it would increase the overall volume. What do you guys think? Quick and easy mod... would it work?

**DansSlk** · 11-30-2007

I don't know i can't see Merc bothering to put them in there unless they do something, probably controlling the airflow to avoid bad MAF readings with the time they spend on R&D i just can't see a simple mod like that doing anything good.

Its not like the box needs them for structure its tough enough with just the outer shell, What i would do is crack the box open and see about adding some additional height to the sidewalls to increase the internal volume.

**dsb** · 11-30-2007

Quote:

Originally Posted by Bill T

I would say that that is exactly what the ribs are for. The problem with the AMG airbox is the volume above the filter. If I recall correct there is less than 1/2 inch near the front, resulting in restricted air flow

Maybe that's the reason all the debri in the filter is collected towards the rear only.

11-28-2007	#1 (permalink)
V8SLK Elite SLK World Member Join Date: Aug 2006 Location: Home of the brave Vehicle: 05 SLK55 AMG Posts: 1,071 Country: Thanks: 40 Thanked 48 Times in 26 Posts	renntech headers Dan, i'm considering a set of renntech headers but i'd really appreciate your input before i get too serious about it. do you think they are worthwhile? can i expect them to create warranty conflicts? should they be supplemented by a new cat back system, etc? thanks in advance...

11-28-2007	#2 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,801 Country: Thanks: 99 Thanked 236 Times in 180 Posts	Totally worth it mod wise but not worth the price they charge but all of the tuners over price these sort of items, you can expect about 20/30 extra horses easy and a quicker revving engine. Exhaust warranty would be void but the engine warranty wont be effected and RennTech would fork out if you had any issues with the headers themselves. You could instal some sports cat's if you wanted mate, it all comes down to price at the end of the day i know that camshafts would be on my list before cats if i where in your shoes right now. Cats are going to give a few horses but from cam's you can expect a boost similar to that given by the headers, the Brabus B55 pack is basically just cam's and they quote 390 so we we take that figure and add 25 bhp for the headers also that puts you at over 400 horsepower. The manifolds are the most restrictive part of the whole system, my advice would be go for it. __________________ One thing you will learn with German cars - If it's simple it ain't happening.

11-28-2007	#5 (permalink)
alroumi Moderator Join Date: Jun 2006 Location: Kuwait City, Kuwait Vehicle: 2006 Kleemann Designo Mocha Black SLK55 AMG Other Toys: 2007 Ebony Jaguar XKR Coupe' and 06 Black Cayenne S Posts: 6,296 Country: Thanks: 306 Thanked 235 Times in 149 Posts	I dont think its 390ish but some tuners over claim the gains that they get, I might be closer to 395hp with Green filters, Ecu update, Kleemann 200 cell primary cats, SuperSprint X pipe. __________________ 06 Kleemann Designo Mocha Black SLK55 AMG 06 Porsche Cayenne S 07 Jaguar XKR Coupe' I use the Torque and keep the HP for my Steak Sauce!

11-29-2007	#11 (permalink)
alroumi Moderator Join Date: Jun 2006 Location: Kuwait City, Kuwait Vehicle: 2006 Kleemann Designo Mocha Black SLK55 AMG Other Toys: 2007 Ebony Jaguar XKR Coupe' and 06 Black Cayenne S Posts: 6,296 Country: Thanks: 306 Thanked 235 Times in 149 Posts	I intened to get headers soon possibly renntech or kleemann because they can clamp on the existing kleemann cats that are on my car. __________________ 06 Kleemann Designo Mocha Black SLK55 AMG 06 Porsche Cayenne S 07 Jaguar XKR Coupe' I use the Torque and keep the HP for my Steak Sauce!

11-29-2007	#13 (permalink)
FishtailnZ Don't feed the trolls... Join Date: Jul 2006 Location: Nfld., Canada Vehicle: 2009 C63 pipelined Other Toys: Wife, kids, dogs... Posts: 1,513 Country: Thanks: 300 Thanked 226 Times in 101 Posts	I noticed the same thing when I had a good look at the setup (while putting in the Greens) a couple months back Bill. No doubt a larger volume airbox would help some, but the price for the Renntech piece is just silly. If someone came up with a similar design, forego the carbon fibre, and priced it aggressively I think it would sell well. As a whole, the M113 engine seems pretty restricted on both the intake side and exhaust. __________________ - Bill Waiting on a 2009 C63 Fire Opal/Alpaca Premium+Media R.I.P. 2006 SLK55 Caspian Blue/Beige Stock 1/4 mile results: ET 12.72, trap 110.80, 60' 1.80 Some guys they just give up living and start dying little by little, piece by piece. Some guys come home from work and wash up and go racin' in the street... - B. Springsteen

11-28-2007	#3 (permalink)
Baron7700 Elite SLK World Member Join Date: Sep 2006 Location: Pennyslvania Vehicle: 2006 Slk 350 Other Toys: Lots of ATV's Posts: 1,601 Country: Thanks: 3 Thanked 3 Times in 3 Posts	What about the DSM or something another chip Mo, and Mw55 was talking about. 400bhp.

11-28-2007	#4 (permalink)
Baron7700 Elite SLK World Member Join Date: Sep 2006 Location: Pennyslvania Vehicle: 2006 Slk 350 Other Toys: Lots of ATV's Posts: 1,601 Country: Thanks: 3 Thanked 3 Times in 3 Posts	I totally agree with you. Its in another post, and, like you, want to see more and how. Sigh, wish there was more cost effective stuff for the 350. Its sad knowing all the money you spend on performance for the 350 can just go towards a base 55.

11-28-2007	#8 (permalink)
V8SLK Elite SLK World Member Join Date: Aug 2006 Location: Home of the brave Vehicle: 05 SLK55 AMG Posts: 1,071 Country: Thanks: 40 Thanked 48 Times in 26 Posts	i just spoke to a good friend of mine who owns an indy shop in town. he said he'd do the install... hhhhhhhhhmmmmmmmmm... ok, now i'm about 99% sure that i'll be doing it.

11-29-2007	#9 (permalink)
VitaminT Elite SLK World Member Join Date: Apr 2007 Location: Alabama Vehicle: 2005 SLK55 Posts: 361 Country: Thanks: 0 Thanked 0 Times in 0 Posts	Why not the supersprints? I think if I was going to get headers I would get the long tubes but that's just me. I guess they won't bolt to stock cats like the renntechs but to me the Renntech looks pretty close to stock for what???$5k. On the ECU tune note. I am not sure if it was the day, or my car or what but when I did my dyno pulls this past summer it was extremely rich. Like 9.5 or 10.0:1. If they all are like that, I can see about 20whp gained with a good tune.

11-29-2007	#14 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,801 Country: Thanks: 99 Thanked 236 Times in 180 Posts	Totally agree the stock airbox is restrictive and so are the stock manifolds. We need somebody with a Renntech box to let us take a mold of it then we can knock out as many as we need in plastic. Slightly harder to copy the headers tho but still nowhere near impossible. Those ratio's do seem higher than what i have seen on them over here. __________________ One thing you will learn with German cars - If it's simple it ain't happening.

11-29-2007	#16 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,801 Country: Thanks: 99 Thanked 236 Times in 180 Posts	I have a fixed number of good idea's per year mate and i have to be careful not to use them all at once. __________________ One thing you will learn with German cars - If it's simple it ain't happening.

11-30-2007	#18 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,801 Country: Thanks: 99 Thanked 236 Times in 180 Posts	I don't know i can't see Merc bothering to put them in there unless they do something, probably controlling the airflow to avoid bad MAF readings with the time they spend on R&D i just can't see a simple mod like that doing anything good. Its not like the box needs them for structure its tough enough with just the outer shell, What i would do is crack the box open and see about adding some additional height to the sidewalls to increase the internal volume. __________________ One thing you will learn with German cars - If it's simple it ain't happening.

11-30-2007	#20 (permalink)
DansSlk Dude Join Date: Jun 2006 Location: Wales Vehicle: 05 B55S (Brabus 6.1 S) Posts: 6,801 Country:

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