It wasnt a "back pressure sensor" I was worrried about. It was the MAFS reading more air and retarding timing. I have heard this happens on some cars with cold air intake. But, according to the w202 forums it is not an issue with the c43. $40 straight pipe is much better than an $800 premuffler.


The recall was on the cats and not on the premuffler

Thanks for the help.