New owner of a 55 amg - exhaust question - Mercedes Benz SLK Forum

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

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#1 Old 03-15-2017
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New owner of a 55 amg - exhaust question

Hi guys, after having my slk55 dropped off by a recovery guy it was reversed into the floor and bent the left pipe. After seeing an exhaust guy they need to put a stainless section in to straighten it as we have already tried heating it up and bending it. While this is being done is it worth cutting out the center silence box? Will it add more low down Rev noise?
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#2 Old 03-15-2017
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Would suggest an x-pipe!


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#3 Old 03-15-2017
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Would that be for noise or flow? It wasn't offered so not sure they can do it? Would 2 straight through pipes do nothing? 120 to do it
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#4 Old 03-15-2017
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To search the site always put SLKWorld.com first to get forum specific results.


https://www.slkworld.com/amgs/159074-...ust-do-11.html
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#5 Old 03-15-2017
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Any exhaust fabricator worth their salt should be able to make and fit one. You could buy a prefabricated one like the Magnaflo. In theory will improve flow/performance and the sound is a massive improvement!

Look for videos on here or YouTube. Better still try to get to a meet and hear one in person.
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#6 Old 03-15-2017
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Why the x shape.
500 for this or two straight through pipes 120? Surely they do the same job.
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#7 Old 03-15-2017
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X pipe seem a little 'louder'
I have a straight pipe but also a supercharger so sound is extra special

see the thread on member's exhaust sounds/videos in the r171 performance mod section
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#8 Old 03-15-2017
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It's good practice to join the flows from the two exhaust banks to increase scavenging (look it up). Your centre resonator serves this purpose and also attenuates the sound.

X-pipes are better for scavenging than H pipes common on American V8s both give different sound effects as do straight pipes.

A Magnaflow x pipe is about 80 and around 140-250 for fitting. Guess you might be looking at an Ebay listing by CKS Performance, they are robbing b******s.
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#9 Old 03-15-2017
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Quote:
Originally Posted by jbanks15 View Post
X pipe seem a little 'louder'
I have a straight pipe but also a supercharger so sound is extra special

see the thread on member's exhaust sounds/videos in the r171 performance mod section
Still have your stock resonator Jeff?
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#10 Old 03-15-2017
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Yes sir!
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#11 Old 03-15-2017
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Not tempted to go for an x-pipe?


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#12 Old 03-15-2017
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I'll say one thing about this site "bang on". Only been on it an hour and answered every question I've got. The exhaust place I use is custom pipes (Doncaster) he might havee some X sections already fabricated so could be reasonably cheap. Either way if it gives me 30% more noise I'll be happy. If not I'll get the drill out ha
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#13 Old 03-15-2017
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Originally Posted by Col View Post
Not tempted to go for an x-pipe?
Haven't I spent enuff money on the Beast already?
nah...very satisfied with the sound and when i stomp it and the sc does its thing, I can be heard a long way aways
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#14 Old 03-15-2017
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Quote:
Originally Posted by Donny_daz View Post
I'll say one thing about this site "bang on". Only been on it an hour and answered every question I've got. The exhaust place I use is custom pipes (Doncaster) he might havee some X sections already fabricated so could be reasonably cheap. Either way if it gives me 30% more noise I'll be happy. If not I'll get the drill out ha
Quite a few of us owners have taken out the centre resonator and secondary cats with x pipe and consider it a great success. No problems with MOT as primaries easily do the job.
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#15 Old 03-16-2017
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Hi All


The X pipe helps with pull the gases along the exhaust , Google it & your see what I mean . There is a long post on this site all about this subject .


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#16 Old 03-28-2017
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Anyone in the UK found it necessary to declare this mod to their insurers and if so, any increase in premium?

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#17 Old 03-28-2017
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^ Insurers will ask if ANY mods have been made. Failure to disclose... And I imagine they will be even stricter after the recent case of two deaths partly attributed to a modded air intake.
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#18 Old 03-29-2017
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...the recent case of two deaths partly attributed to a modded air intake...
Say what now? How earth can that happen?
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#19 Old 03-29-2017
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Originally Posted by osi View Post
Anyone in the UK found it necessary to declare this mod to their insurers and if so, any increase in premium?

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I declared that as a non performance mod just for sound and a couple of other cosmetic mods, increased it by 20 or so, not much.
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#20 Old 03-29-2017
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Quote:
Originally Posted by Terminal View Post
^ Insurers will ask if ANY mods have been made. Failure to disclose... And I imagine they will be even stricter after the recent case of two deaths partly attributed to a modded air intake.
Must have been some mod to be attributed! Nitrous cold air 2 stage twin turbo maybe?

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