Quote:
Originally Posted by HeyKC
Most stage 2 tunes require the catless DP. Or at least a high flow cat. I'm no tuner so I dont know why. Does your exhaust already have the controllable valve flaps?
For the rattle I try and find where its coming from. It could be a WG rattle that some speak of.
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Most do require catless pipes for s2 although I heard Dinan talk about his newest S2 and S3 tunes for the s63 and he said it’s all BS more or less. Said if tuned proper you should only be losing 5-10hp compared to catless pipes. Hadn’t heard this before, but would be nice to have my cats on the car if I could get similar performance.
Exhaust rattle appears to be a result of downpipes from what I’ve read.