Hi all Mercedes lovers.
I'm thinking of mounting Downpipe with cat on my E63s. I drive a lot and like that it does not say anything when I cruise on the highway. will it say more with Downpipe in Comfort mode with flaps close, or is it only in sports mode it will make more noise?

Thank you

 

It was my biggest question and no one could really answer it. So I installed them and would say comfort mode (closed) is now slightly less quiet then sport mode (Open) used to be. It’s pretty chill but fairly loud on startup in any mode.

 

which brand of high flow cat downpipe did you go with? Seems like renntech is the only one that doesn't need a tune with theirs

 

Are yours with or without a cat? is it worth it to switch Downpipe?


i have looked at some from supersprint where the primary cat has been removed.

 

I got mine from Shardul here on the forum, no cat.

 

it is a good question, i'm would like to hear the difference as well