Anyone with aftermarket or no cats on supercharged V8?
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Anyone with aftermarket or no cats on supercharged V8?
I am looking to redo my exhaust system on my SC CLK55. My exhaust guy does not want to change my cats because he said the AMG cars flow very well and that cats such as Rapid Technologies, would not yield any gains.
We are going to go with a 4" exhaust with a 4" resonator and 4" race muffler after the cats.
Does anyone have any knowledge about gains with changing or removing the cats on a supercharged MB?
Thanks.
We are going to go with a 4" exhaust with a 4" resonator and 4" race muffler after the cats.
Does anyone have any knowledge about gains with changing or removing the cats on a supercharged MB?
Thanks.
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Joined: Jun 2003
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From: nj
a car that can't do the throttle reset.
cat removal will hurt your low end torque, and trigger CEL. AMG cats are pretty well made... i wouldnt recommend it... i had it done on my 211 E55... hurt my torque so had them put back in.
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Joined: Apr 2002
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From: Sacramento
AMG C43, 1999
Removing the 2nd set of cats can reduce backpressure and help performance. But it is going to take several days for the computer to readjust. With the 2nd set of cats gone I do not think you are going to see a CEL.
If you remove the 1st set of cats then I would think you will see a CEL.
As for Mercedes cats, I think they are OK but not great, there are better Metallic cats out there that will yield more Hp.
Jeff
If you remove the 1st set of cats then I would think you will see a CEL.
As for Mercedes cats, I think they are OK but not great, there are better Metallic cats out there that will yield more Hp.
Jeff
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Thanks for the responses.
I pretty much decided to just go 3.5" after the cats with a straight through 3.5" inlet/outlet Magnaflow muffler.
I am leaving the stock cats in. I also do not want to swap in the cats every year for inspections.
I figure on a supercharged car, bumping from a 3" to a 3.5" will help.
I will keep you posted.
I pretty much decided to just go 3.5" after the cats with a straight through 3.5" inlet/outlet Magnaflow muffler.
I am leaving the stock cats in. I also do not want to swap in the cats every year for inspections.
I figure on a supercharged car, bumping from a 3" to a 3.5" will help.
I will keep you posted.
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Joined: Dec 2003
Posts: 4
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From: Laurel MD
1998 C43
Originally posted by sajecw
Thanks for the responses.
I pretty much decided to just go 3.5" after the cats with a straight through 3.5" inlet/outlet Magnaflow muffler.
I am leaving the stock cats in. I also do not want to swap in the cats every year for inspections.
I figure on a supercharged car, bumping from a 3" to a 3.5" will help.
I will keep you posted.
Thanks for the responses.
I pretty much decided to just go 3.5" after the cats with a straight through 3.5" inlet/outlet Magnaflow muffler.
I am leaving the stock cats in. I also do not want to swap in the cats every year for inspections.
I figure on a supercharged car, bumping from a 3" to a 3.5" will help.
I will keep you posted.
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Super Member
Joined: Apr 2002
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From: Sacramento
AMG C43, 1999
I put a dual 2.5" diameter exhaust on my C43 from the 2nd set of cats back. I used a Magnaflow muffler that is shaped like an "X" pipe on the inside. It took a few days for the ECU to adjust and then the car really ripped. Very good low, mid and much better top end. Revs out hard on top.
I also replaced the 2nd set of cats later on on that also helped out. Total backpressure from the stock cats back to the tail pipe was 4.5psi and with the new cats it's 2.5psi. Power output climbs nicely with the lower backpressure.
Your engine gets all the backpressure it needs and then some from the 1st set of cats.
Jeff
I also replaced the 2nd set of cats later on on that also helped out. Total backpressure from the stock cats back to the tail pipe was 4.5psi and with the new cats it's 2.5psi. Power output climbs nicely with the lower backpressure.
Your engine gets all the backpressure it needs and then some from the 1st set of cats.
Jeff
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Joined: Feb 2004
Posts: 258
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From: Perth,Australia
quote "You may want to check into that. Sometimes a larger diameter pipe will cause you to lose power."
This is true for naturally aspirated engines as it is important for the exhaust to be tuned correctly, however for turbo or supercharged engines for that matter generally the larger the diameter the greater the gains
This is true for naturally aspirated engines as it is important for the exhaust to be tuned correctly, however for turbo or supercharged engines for that matter generally the larger the diameter the greater the gains
