an urgent question for those with headers - Mercedes Benz SLK Forum
Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 1 Week Ago
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an urgent question for those with headers

I'm at the point of fitting my headers and have realised that there is no way that the primary cats can go in there.

How have you got round this? Are you using sports cats and secondaries? Are you just using the secondaries? Are you totally catless? Are there any emissions or M.O.T. test worries?

If you're using the secondaries I'll assume that there is no space for the x-pipes.

Just about to start work so unable to research fully right now :-(
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#2 Old 1 Week Ago
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Here is mine, no 1st cat...only 2nd cat, resonator, mufflers, etc
straight pipes, no x pipe

front old first then front new





old then new



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File Type: jpg frontold.jpg (91.7 KB, 97 views)
File Type: jpg frontnew.jpg (64.3 KB, 95 views)
File Type: jpg towardsfrontold.jpg (53.5 KB, 94 views)
File Type: jpg looking tofrontnew.jpg (67.4 KB, 96 views)
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a few more......
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#4 Old 1 Week Ago
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I think that Andy ( @ZeroZero ) has headers and no primary cats, but does have x-pipe instead of centre resonator, and still has his original secondary cats in place.

I think that @Benzedup may also have a similar set-up on his SLK too.

I've tagged both, in the hope that they will respond to confirm, or add any other comments...
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#5 Old 1 Week Ago
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Hi All
Yes what he said .
Headers , no front cats , secondary cats , Xpipe , rest as standard & a friendly MOT bloke. . If your trying to keep it all above board I think your need two sets of cats or two very large cats . If you go for one large cat your look like Dr Evil.

Cheers

Andy
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#6 Old 6 Days Ago
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(Thread Starter)
I suspect it may be a while before the headers go on (current finances mean everything has to be done piecemeal, the obvious downsides of this:

it can end up costing more in the long term
I'm impatient (as can be seen from the other headers thread)
there is a chance that bits 'n' bobs cobbled together may not actually work in conjunction with each other (leading us back to point 1)

That being said it is interesting!

Many thanks to @ZeroZero and @jbanks15 for putting up with numerous (dumb) questions and posting pix
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I have the Kleemann headers and down pipes (no primary cats)
Original secondary cats
X-piped res
Stock back boxes.

Interms of MOT, the secondary do just enough to pass it with no issues.

Here are some pictures of my setup, I hope that helps.





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thanks for that there is now a good selection of pics I can show my garage to put their minds at rest (long standing friend is aware that this is my 'baby'!). Luckily the fit had to be put back 3 weeks so between you, zerozero & jbanks15 I should be ready for some extra noise (actually it'll be better than a blowing manifold
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Hi All


Hey Benzedup you been taking pictures of my car , That looks just like mine. So it will pass MOT cheers .


Cheers


Andy

2005 Obsidian Black 55 AMG
Black Power Coated Rims with Diamond Cut Edge
Magnaflo Xpipe kept all 4 Cats (now two removed)
Shorty Antenna (no signal type)
Tar.ox Front Rotors
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Kleemanns Headers
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Same setup a jbanks15 here (minus the blower), no problems with emissions testing. I know that doesn't help at all with the MOT inspection.

I swear I'm going to start stealing jbanks15 pictures and claiming it as my car. I mean the wheels are different and I'm down a blower, if you overlook the fact that his car is always pristine and mine is always filthy (just drove 15 miles in the pouring rain this morning), they're practically twins, .
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Originally Posted by ZeroZero View Post
Hi All


Hey Benzedup you been taking pictures of my car , That looks just like mine. So it will pass MOT cheers .


Cheers


Andy
Lol, where did you have yours installed?
Do you have the Wiestec tranismission oil cooler too?
Would be good to see some pictures mate.
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