R171 350 exhaust upgrade - Mercedes Benz SLK Forum

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

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#1 Old 02-15-2019
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Right. Decided to start some upgrades before the 4BallR event in June, and today been to 2 exhaust specialists. Gave me different options. Bit of advice.

Kelteck in Leeds do powerflow and told me to do a cat back.

Tony Banks in Leeds, said back boxes only would be needed.

Any thoughts. Looking for more rasp, if you will, especially low down revs as only really enjoy the noise at 3500rpm to 5000rpm, but don't want big bore sound.

Did look for old threads but mostly about 55's

Cheers
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#2 Old 02-15-2019
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Also, tip choices. Larger oval, round twins or AMG (extra £100 as bumper to be cut).

If I sold the car and had kept the old exhaust to sell with it, could the buyer just take off the larger AMG tips and refit them to the standard exhaust if to loud for the buyer (because of the larger cuts). I forgot to ask the garages but you lot are a wealth of information and opinions!
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#3 Old 02-15-2019
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I would just go for a resonator delete (I believe the 350 already has a Y pipe).
Keep the standard rear boxes and just get them to change the tips.
If they make the resonator delete with flanges and weld flanges to the old resonators then they can be easily swapped back in if a new owner doesn’t like the sound.
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#4 Old 02-15-2019
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@davest4s Trying to remember what you did to Marissa's.
Although I didn't hear it personally, I do recall many positive comments.

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#5 Old 02-15-2019
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I did this on my slk.
https://www.slkworld.com/slk-r171-ge...haust-mod.html
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#6 Old 02-15-2019
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And if you want to have a spare system for the next owner so you can go to town on your existing system, someone near me is selling a 350 standard system - have a look in the for sale section.
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#7 Old 02-15-2019
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I'm recording soundbites from the 55 and will play them on the stereo.

Same idea some expensive car system use.

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#8 Old 02-15-2019
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Quote:
Originally Posted by Mugs View Post
I would just go for a resonator delete (I believe the 350 already has a Y pipe).
Keep the standard rear boxes and just get them to change the tips.
If they make the resonator delete with flanges and weld flanges to the old resonators then they can be easily swapped back in if a new owner doesn’t like the sound.
Well remembered, Sir.


https://www.slkworld.com/slk-parts-s...ollection.html

£100.

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#9 Old 02-15-2019
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Originally Posted by Davyd1975 View Post
Right. Decided to start some upgrades before the 4BallR event in June, and today been to 2 exhaust specialists. Gave me different options. Bit of advice.

Kelteck in Leeds do powerflow and told me to do a cat back.

Tony Banks in Leeds, said back boxes only would be needed.

Any thoughts. Looking for more rasp, if you will, especially low down revs as only really enjoy the noise at 3500rpm to 5000rpm, but don't want big bore sound.

Did look for old threads but mostly about 55's

Cheers
Hi.
I’ve had the second cats (resonator boxes) removed and am very happy with the result.
It’s not v8 loud and with the top up you’d not notice much change ... but get the top down and give it some gas ... and it’s all smiles
A small sound clip is here. ..
https://www.slkworld.com/4412035-post21.html

Mike.
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Modifications ..
Tinted rear lights, Chrome bonnet fins, LED DRL/fog lights,
S200 Android head unit, Paddle shift installed, dash cam,
Resonator boxes (2nd Cats) removed, smart top.
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#10 Old 02-16-2019
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Originally Posted by Avel Du View Post
@davest4s Trying to remember what you did to Marissa's.
Although I didn't hear it personally, I do recall many positive comments.
As per Mike above, we deleted the resonator. As Mike says increased the rasp nicely with no downsides. Not a major difference, but worth doing considering it's a relatively cheap option.
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Above photo is a breakfast meet in the inner courtyard at Wilton House.
Upgrades: X pipe and secondary cats delete, smart top, John's 3rd brake light module, DRLs, carbon rear spoiler wrap, black vinyl roof wrap, rear window tint, chrome front indicator bulbs, led number plate bulbs, white fog light bulbs, extra bright led reversing bulbs, stubby antenna, refurbished wheels in chrome silver rims and anthracite sparkle centres, remapped by GAD Tuning.
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#11 Old 02-16-2019
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Quote:
Originally Posted by Davyd1975 View Post
Right. Decided to start some upgrades before the 4BallR event in June, and today been to 2 exhaust specialists. Gave me different options. Bit of advice.

Kelteck in Leeds do powerflow and told me to do a cat back.

Tony Banks in Leeds, said back boxes only would be needed.

Any thoughts. Looking for more rasp, if you will, especially low down revs as only really enjoy the noise at 3500rpm to 5000rpm, but don't want big bore sound.

Did look for old threads but mostly about 55's

Cheers
R hey Davy Ill have to get a wriggle on and sort the exhaust paint job took priority.
But think my exhaust is fudged so it sounds better But not as good as it could.
Esp inbetween davyscaff and avel du

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#12 Old 02-16-2019
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The facelift 350 with 305bhp already has the x-pipe and should sound pretty good straight out of the box. Subtle but aggressive I would say :
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#13 Old 02-16-2019
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All slk r171 350 ( not only the facelift ) have the X pipe as standard.

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#14 Old 02-16-2019
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Shows my lack of R171 knowledge 🙄🙄
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#15 Old 02-17-2019
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What a great responce, thanks all. Considering the delete cat.
Anyone ideas on swapping tail pipes round. Obviously if you can't that easily, would put me off the AMG pipes.
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#16 Old 02-20-2019
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Quote:
Originally Posted by Davyd1975 View Post
Right. Decided to start some upgrades before the 4BallR event in June, and today been to 2 exhaust specialists. Gave me different options. Bit of advice.

Kelteck in Leeds do powerflow and told me to do a cat back.

Tony Banks in Leeds, said back boxes only would be needed.

Any thoughts. Looking for more rasp, if you will, especially low down revs as only really enjoy the noise at 3500rpm to 5000rpm, but don't want big bore sound.

Did look for old threads but mostly about 55's

Cheers

I have basically the same query, just that my car is a R172.


I spoke to an exhaust place, and the options we ended up with were replacement of the resonator with an x-pipe, or replacement of the back boxes.


I was recommended the back box route as the sound was more tuneable. They said they would remove the back boxes and run the car without them and work out what was required of the new back boxes. I was planning to retain the original exhaust outlets to keep it stock looking (the outlets are more faired in on the R172).


The back box option was more expensive than the resonator delete, but appeared to offer more potential for tuning.
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#17 Old 02-22-2019
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Quote:
Originally Posted by GriffSLK View Post
Quote:
Originally Posted by Davyd1975 View Post
Right. Decided to start some upgrades before the 4BallR event in June, and today been to 2 exhaust specialists. Gave me different options. Bit of advice.

Kelteck in Leeds do powerflow and told me to do a cat back.

Tony Banks in Leeds, said back boxes only would be needed.

Any thoughts. Looking for more rasp, if you will, especially low down revs as only really enjoy the noise at 3500rpm to 5000rpm, but don't want big bore sound.

Did look for old threads but mostly about 55's

Cheers

I have basically the same query, just that my car is a R172.


I spoke to an exhaust place, and the options we ended up with were replacement of the resonator with an x-pipe, or replacement of the back boxes.


I was recommended the back box route as the sound was more tuneable. They said they would remove the back boxes and run the car without them and work out what was required of the new back boxes. I was planning to retain the original exhaust outlets to keep it stock looking (the outlets are more faired in on the R172).


The back box option was more expensive than the resonator delete, but appeared to offer more potential for tuning.
Cheers Griff. I sent all this in a email to CSK performance in York. After a few emails, I'm going to go see them. They said that all 3 were standard options/answers but only by seeing my car could they advise further. I got told that you could not 'pick?' the sound it would make, what will be from a Merc V6 will be. I envisioned a f type rasp if you will at the start of this. Really need to hear something in person instead of you tube I think, to get a better idea of volume
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#18 Old 02-25-2019
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Please let us know how you get on
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#19 Old 03-19-2019
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Smile R172 SLK 350 X-pipe

Also posted this in the R172 section, but worth repeating here based on the previous dialogue that I entered into above:


Took the plunge at the weekend, and had a x-pipe fitted in place of the central resonator on my SLK 350 (R172).

The exhaust has more burble at low revs, and has a nice rasp with a bit of edge to it through the rev range. With the top up and in the cruise it doesn't really appear to be any louder, but you can hear it when accelerating.

With the top down you can hear a lot more going on which is great. It is still not really loud but removes the rather 'flat' exhaust sound (it is a V6 after all).

Overall very pleased with the result, and it also didn't cost too much
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#20 Old 03-19-2019
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Is that an x pipe or straight pipes?
Mine looks different.
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