Hey experts!
Is it imperative that I replace the exhaust pipes when I install a new muffler? I'm plannning on getting a Flowmaster installed soon. My X only has 3500 miles on it and the pipes are basicaly new. I guess I'm asking if I will lose some sort of gains if I don't get the pipes replaced along with the muffler. I've read some threads here about increasing the size of pipe diameter. Any info would be great.
Thanks in advance