jfmiii

After a year of hesitation, I've decided to chop my resonator and secondary cats off my C55. Th exhaust shop I spoke to doesn't use stainless steel piping but said I could bring in my own and they'd cut and weld it. My car is currently bone stock. I've searched past threads for sizing and some say 2.5inch while others say 2.5in from primary cats to res and then 2.25in from res to mufflers. For those who have done this, what size pipe did you use? Is 304L stainless steel what I should be looking for? What length should I buy? Not concerned with having some excess.

Socal Sam

Don't chop. Replace. Stock cats and mufflers are worth a fair amount if kept intact.

Stephen04E55

does anyone aftermarket besides supersprint make bolt on sections? I suppose a custom setup may be necessary.

jfmiii

I'm definitely keeping the res and cats....just in case I change my mind!

Socal Sam

Keeping the originals will be handy if and when you decide to sell. Modified cars with chopped exhausts are worth less than all stock.

jfmiii

So I ended up chopping just the resonator out and left the secondaries. I may go back and do the secondaries at some point. The res delete is very subtle. A bit more growl but not too much volume increase. The results are what I expected. Here is a before and after.