From a thread I read a little while ago, some guy mentioned that his X pipe actually smoothed/quieted the sound of the c63 and made it lose a bit of that growl... but in return refined the sound coming out of the exhaust. Why is this? Thanks in advance!

 

Ask this guy...

https://mbworld.org/forums/c63-amg-w...vs-h-pipe.html

 

Smooth blending of the exhaust pulses from each bank of the engine. Refines the exhaust sound and makes it sound a bit more high revving and exotic and I believe improves low end torque a bit. The OEM sound is a bit more rough, ready and angry sounding and sometimes sounds like the engine has a miss.

 

I personally like the straight better but I am biased. I got rid of both cats and res with straights and I love it! Loud when you floor it and a nice rumble when driving in comfort.

 

I just removed my resonator with straights. It sounds really angry now. Refined - not at all. I love it neighbors probably not so much.

 

Now pipe the secondary cat (which is what we were talking about) lol. I have my reso's straight piped too. but deciding what to do on the secondaries.