Resonator/ Secondary Cat Removal - Mercedes Benz SLK Forum

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

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#1 Old 09-23-2015
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Resonator/ Secondary Cat Removal

Anyone have an idea of what it would cost to mod my exhaust on my 55 by removing the resonator and the secondary cats? I've seen numbers with people that have removed the resonator but not the 2nd cats too.
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#2 Old 09-23-2015
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see my thread in my sig block
removal of primary cats
ecu tune
headers
downpipes
straight pipes
resonators
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Last edited by jbanks15; 09-23-2015 at 10:18 PM.
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#3 Old 09-23-2015
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Whilst I'm sure that Jeff's mods are awesome (wish I lived nearer to see & hear them), they're much more expensive than a simple centre resonator & secondary cat delete. The secondary cats are situated just behind the centre resonator, so can very easily be removed for very little extra effort and cost while removing the centre resonator (in fact, I'd be amazed if it really did impact the cost at all).

When I had mine removed, the piece that was cut out that included the centre resonator and 2nd cats was still small/short enough to fit in my boot/trunk for me to take home with me (just in case I ever want to have it put back in - which I don't!).

I don't know what the costs are in the US, but you can get this done in the UK, and have an x-pipe fitted in its place, for around £300 (or less at some exhaust shops).
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#4 Old 09-23-2015
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Hi All


@ JBanks I did not know you had the resonator removed , I understood you kept it .

@slk8907 If you buy a pre-made Xpipe this could bring the price down abit more , If I remember my Magnaflow Xpipe was about £80 & about £50 to fit it but I kept the 2nd Cats (being a good boy) . but you remove the 2nd Cats as well its still only two cuts & an extra bit of straight pipe .


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#5 Old 09-23-2015
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Hi all,

I really want to do this to my Slk280 (changing exhaust x-pipe and cat backs ) Is there anyone who has had this done on a 2007 Slk280. One is it worth it on car, two -would I gain added horse power 3- I really want a mean sound.
Any advice would be much appreciated, Thank you!
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@ JBanks I did not know you had the resonator removed , I understood you kept it .

sorry, typo on my part
I have both resonators. My primary cat was removed.
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#7 Old 09-26-2015
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Well I had the resonator and the secondary cats removed today, had them replaced with straight pipes. All I can say is WOW !!! Especially since it was only $80... I should've done this along time ago
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#8 Old 10-04-2015
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slk8907

do you have any of that dreaded exhaust drone between 1700 - 2000 rpm now that you've removed the resonator?

Ive read this is an issue and didn't pull my box when I swapped in headers and pulled the front cats.
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#9 Old 10-04-2015
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Originally Posted by slk8907 View Post
Well I had the resonator and the secondary cats removed today, had them replaced with straight pipes. All I can say is WOW !!! Especially since it was only $80... I should've done this along time ago
Do you have any other exhaust work done?

I like the headers/primary cat removal sound, but am thinking a test pipe in addition would be too loud.
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#10 Old 10-04-2015
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Maybe a very light drone but nothing that stands out.
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#11 Old 10-04-2015
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Nothing else has been done to the exhaust. I do have green filters and the eurocharged tune.
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#12 Old 08-13-2016
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£230 for 2nd cats plus replace resonator box with magnaflow x box. Pipe Dynamics in Leven Fife.
Very happy with result.
Don't do it unless you like loud exhausts!

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