Does anyone know if I take the Cat off my car will I Increase any horsepower. I plan on taking out the resonator and my friend suggested the cat to but I'm not shure. I had a Volkswagen Scirroco put a throttle body and Exhaust on it but then I took out the cat and I lost performanes. Anybody have any Suggestions.

Ditch the resonator, upgrade the muffler, and keep the cat. Along with the obvious illegality, the cat provides the "limited backpressure" actually required by your exhaust system to make more power. Eliminate all the backpressure and you will have an experience similar to the one you had with your Dub. Paul.

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'99 SLK230 (Bahama Blue)
17" O.Z. Racing "Vela" Modular wheels
AMG sideskirts
SL style grill
Color-Matched roadster bars
Custom rear wing
Real carbon fiber interior

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With 200k miles you might want to consider replacing your cat, but don't get rid of it. I just had a custom, 3 inch, cat-back exhaust fabricated for my euro 500 SEL and, evidently, the increased flow accelerated the demise of my cats (190k miles). I had the cats replaced with new, free-flow cats and the power delivery became smoother (better low-end torqe) while the engine still breathes just fine at the top end. The sound is pretty mellow and they aren't expensive unless you go to the dealer for one.

New generation cats do not rob performance and help keep the air clean...it's a worthwhile thing to do.

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Richard Detoy
'84 300SD
'76 Moto Guzzi 850 Le Mans

i will be replacing my cat very soon.
are aftermarket cats any good? which brand?

You all should check out a company called Timevalve Mfg. Co. They make direct fit SS exhaust and cat. components for ALL M-Bs. I've been doing a fair amount of research on this lately and they seem like the right choice. I also believe they can work with customers who have certain requests like ditching the center resonator. I will most likely work with this company when mine starts to fail.

http://www.timevalve.com