i have read alot of different opinions about the stock exhaust and have came to the conclusion that all i want is sound difference, stock pipe size is fine so why can i not just buy mufflers it seems like. Cpe, cobb, etc who makes exhaust dont just sell mufflers. I just welded mufflers into my gto and was what i wanted and was happy.Why not for this car? What size would i need if i found one?