Dear all, I've a sport exhaust and would like to have a little bit more grunt and volume from my car. Don't want to void warranty with cat removal, and don't want to remap the ECU. So, the only option would be to change the back-pipes with something more straight. Question is: is it going to make a sensible difference or not from the sport exhaust? Worth it or not?
And another question: the sport exhaust in Europe seems to have 2 levels of valves. I see one is positioned just at the end of the back pipes (they've been modified to remain always open) and it seems to me there're other valves that open up when in track mode, as the sound in my car get louder . Do you confirm? Is there anyway to keep those also always open?
Thank you for your help.