Custom better than branded exhaust? - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 04-04-2014
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Custom better than branded exhaust?

I've been looking for an exhaust for a while but I havnt seen anything second hand pop up as of yet so I was searching for a valved exhaust and stumbled accross this one on ebay for $300.
My theory to this is being that it can silence the exhaust sound you can straight pipe or change the cats without making the car to loud. Also the tips can be made into Mercedes rips with some welding and the car still looks stock like it's out of the show room with the standard single tip on both sides. What are your thoughts on this I have been quoted $400-600 for fitting and piping and the exhaust and tips together shipped to Australia are about $800. Should I be the first to go along this path? Or is it risky...
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#2 Old 04-05-2014
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I'd say this was big risk.If you do a search on here you'll find numerous examples of people who've tried aftermarket exhausts and found them too loud or boomy. To be sure you'll have to go for a branded or '55 exhaust.
The Magnaflow or similar boxes are a much smaller volume for a given length than the original and just don't quieten the exhaust enough for comfortable cruising.
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#3 Old 04-05-2014
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Originally Posted by slk01 View Post
I have been quoted $400-600 for fitting and piping and the exhaust and tips together shipped to Australia are about $800. Should I be the first to go along this path? Or is it risky...
Nooooooooooooooooooo! With the SLK350 V6 there is a very high risk of booming/droning with mufflers that haven't been specifically designed for that motor.

If you are patient you should be able to eventually pick up either an SLK55 system or something specifically designed for the 350 second hand for a grand or less.

If you can't wait, you could always go down to Mars Performance in Clayton and have a look at the custom exhaust they sell on Ebay:

http://www.ebay.com.au/itm/130908623770

Cheers,
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#4 Old 04-06-2014
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Agree, a definite no.
Your engine is designed 'as one' - i.e. everything from air intake to exhaust outlet is critical to the way it operates. Exhaust boxes with boy-racer valves, apart from being a waste of time, will upset the back pressure that the engine wants to see. Eventually it will just give up and throw back lots of annoying codes.
If you want one of these boxes, there must still be lots of old Torranos around still that you could use, no..?!
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#5 Old 04-06-2014
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The thing is in Australia they have varex exhausts which they use on hsv not saying that they are Mercedes worthy but the thing is if you think about it they say that the only difference when the valve is closed is that it doesn't go straight through meaning that it will sound like stock until you need it. Plus with a custom x pipe and some piping you could get the same or more hp than a full supersprint exhaust.... no? Or is this to good to be true :/
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#6 Old 04-07-2014
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Originally Posted by slk01 View Post
the only difference when the valve is closed is that it doesn't go straight through meaning that it will sound like stock until you need it. Plus with a custom x pipe and some piping you could get the same or more hp than a full supersprint exhaust.... no? Or is this to good to be true :/
Yes, it's too good to be true.

First things first, I don't know why this is so but the SLK 3.5L engine is a fairly loud device to begin with. If you have an exhaust that has the option of essentially being 'straight through' when a valve is opened or whatever, you're going to hear it from miles away! Secondly, most n/a engine exhaust systems are carefully tuned to maximise the exhaust scavenging effect and arbitrarily changing the exhaust characteristics can lead to a loss rather than a gain in power.

Lastly, the SLK350 already has an X-pipe in the stock exhaust system, so changing that is not likely to be very productive in terms of either noise or power. Regardless of what you do to the exhaust (short of installing a full system including carefully tuned headers) you are not going to see more than a handful of extra hp at best, so any changes you do make are pretty much limited to making a nicer noise...

Cheers,
Brian
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#7 Old 04-07-2014
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the only difference when the valve is closed is that it doesn't go straight through meaning that it will sound like stock until you need it.
it will only sound like stock if the internals that the gas it routed through have the same characteristics - which I'm guessing they absolutely won't have.
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#8 Old 05-20-2014
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Im looking at getting the Exhaust on my 200K done now ive got my rear diffuser. Im getting the entire exhaust (inc. manifold) done with an electric exhaust cut out and sports cats (x2) done with a quad tail pip for Ł750... 2 cats are needed with chambered backboxes as any sort of decat or straight pipe/ free flow pipe would be 'unbearable' to live with...
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#9 Old 05-20-2014
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Has anyone...

Has anyone cut open the stock mufflers and "redesigned" the baffle design/placement?

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#10 Old 05-20-2014
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#11 Old 08-30-2014
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Angry SLK Sports Exhaust

Please don't do it.

I did, and I regret it.

I had a custom made stainless steel sports exhaust fabricated and fitted because I wanted a more sporty engine note and I reckoned that any increase in HP, no matter how tiny, was worth having. I had the engine re-mapped at the same time [2004 SLK350]

The remap was a tremendous success and I'd recommend that, however the exhaust was difficult and not entirely what I'd bargained for.

I had the work done by a firm called MIJ based in Stafford.

They're workshop is a long way from home for me but I did my research thoroughly and they seemed to offer both service and value. They took all day to make and fit the exhaust which consisted of pipes from the X junction back to two new silencers of theirs and all seemed well until I hit the motorway on the way home. The engine note at cruising speed was a very loud and irritating drone, I mean really horrible.

I phoned them when I got home and it transpired that they'd put the wrong boxes [too small] on the back, and with profuse apologies they offered to put this right and that they'd pay my petrol money for the repeat visit. Another three hour drive up to them ensued the following week and again I hung around the waiting room all day while the replacement larger silencer boxes were fitted, they look large and clumsy, by the way. The outcome was marginally better sound wise, but certainly not satisfactory, the noise was still very wearing. They also failed to come up with the money to cover my second long drive up to visit them, which the man there had promised, I felt that I'd been swindled on this count.

So here I was with Ł300 less in my wallet and a car that was a misery to drive. My solution was to fit a pair of baffles inside the new tailpipes, these things were designed for motorbikes but they worked well in toning down the awful drone on the motorway. So, for exhaust note I was happy, albeit I didn't like the bodge up nature of the thing; my car is a nice car.

The big problem was that I'd also acquired with the new exhaust an awful vibration at certain rev ranges. It turned out that the replacement exhaust parts were badly made/fitted to the extent that the fitter at MIJ had loosened some bolts on a cross member on the underside of the car to avoid the new exhaust components touching the bodywork, what's more even with this dodgy modification the pipes still touched the body and hence a vibration from the engine/exhaust is transmitted straight to the bodywork and to me. I can't alter this, my local MB Indy has tried twice to fix it and it's still a pain in the arse.

In the longer term it's my intention to change this dreadful lash up exhaust for a properly manufactured sport exhaust for the vehicle. I blame myself for trying to save money, but there you go.

So, at the end of it all, my advice is this: If you want to get a sports car sound from your exhaust pipe get genuine MB SL55 bits or use one of the big well known manufactures who make sports exhausts for the SLK. Don't do cheap.
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#12 Old 08-30-2014
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I would think deleting your rear mufflers and swapping in some magnaflow street series mufflers would sound pretty good.
Magnaflow street mufflers tend to be only 'slightly' louder than stock, until you go full-throttle... A lot of the Audi and BMW tuners use magnaflows for that very reason, to simply just turn the exhaust volume up 'slighty.'

Anyone swapped their rear mufflers for magnaflows on a 350?

Honestly, this sounds pretty tolerable on a C350 https://www.youtube.com/watch?v=ZVBS3rvQo94

Another option might be to add headers, but keep stock exhaust from the cat-back. Headers will add a bit more volume, but the stock exhaust will battle the drone
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#13 Old 08-31-2014
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I still want the Eisenmann race exhaust second hand but there are none for sale anywhere :/
I was thinking of changing just the mufflers for hotdog exhaust on each side
Not to straight through but straight through enough
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#14 Old 09-01-2014
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Originally Posted by slk01 View Post
I still want the Eisenmann race exhaust second hand but there are none for sale anywhere :/
I was thinking of changing just the mufflers for hotdog exhaust on each side
Not to straight through but straight through enough
If you actually heard my Eisenmann Race system in the flesh, you'd already be saving up your pennies for one...

http://vbox7.com/play:d062c8a5c0


If the budget just won't stretch that far, rather than hack up your exhaust with some hotdog resonators, go check out this system from Mars performance in Clayton:

MARS Dual Outlet Twin Muffler Exhaust for Mercedes-Benz SLK R171 | Mars Performance

It at least looks as if it's been specifically designed for the SLK and it's the only such system I've seen that retails for under a grand.

Last time I talked to the guys there they said they expected to either have a car to show or a sound clip of the system to listen to. Maybe you could even make a deal where they would take the system back if you weren't happy with it.

The only other tried and tested option is to fit a used SLK55 exhaust (several threads on here about that) but that involves quite a bit of labour to fit and they don't come up for sale in Oz very often either.

Cheers,
Brian
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#15 Old 09-01-2014
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Brian,
Eisenmann's web site doesn't mention any products for the 350 - where did you find yours?
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#16 Old 09-01-2014
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Eisenmann don't make the exhaust anymore only ones left are second hand
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#17 Old 09-01-2014
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Originally Posted by efair View Post
Brian,
Eisenmann's web site doesn't mention any products for the 350 - where did you find yours?
I got mine second hand from a member on SLKWorld.


Quote:
Originally Posted by slk01 View Post
Eisenmann don't make the exhaust anymore only ones left are second hand
Hmm, that's interesting - here's a few links that still advertise it:

Eisenmann Stainless Axleback Exhaust 4x83mm Round Tips Mercedes-Benz SLK350 05-0

Exhaust Systems - Eisenmann Exhaust Mercedes Benz R171 SLK350 4 x 83mm Eisenmann Performance Exhaust Need4Speed Motorsports

Mercedes (R171) SLK 350 Eisenmann Exhaust

Either they have old stock or haven't updated their sites lately.

Cheers,
Brian
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#18 Old 09-02-2014
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hey if it is any help ,, i had my exhaust custom made here in melb ,, after 4 attempts at no extra charge , we worked out a great combo with custom made mufflers... if u like we can organise a meet and u can have a listen to my car ..
Bac sorted his car out and sounds awesome with the mods he made to fit the SLK 55 , so at least you have some options .. otherwise splash the cash .....

good luck and don't waste your money on those silly flaps....
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#19 Old 09-02-2014
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resonator delete

I was thinking of trying to remove the two resonators near the xpipe and leaving the stock mufflers a try. Dunno if it will make any substantial difference as they appear to be straight through with mesh and packing around.
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#20 Old 09-02-2014
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Originally Posted by kirky144 View Post
I was thinking of trying to remove the two resonators near the xpipe and leaving the stock mufflers a try. Dunno if it will make any substantial difference as they appear to be straight through with mesh and packing around.
Mucking around with the resonators won't make much difference, with the SLK350 it's all in the mufflers. This has been proved by people who've swapped SLK55 mufflers onto their SLK350s and got a BIG increase in volume.

Cheers,
Brian
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