Originally Posted by
blackTEG99
stupid question, im about to buy a full exhaust, and i was wondering if a full 3 inch cat back would be to big for my motor, will i have enough back pressure? or should i run 2.5... right now i have a skunk2 I/M,dc 421 2 piece header, aem full ram..help please
A 3" would be too big given your current mods.
Ideally, you'd want to maintaining the same diameter as the output from your header through the cat to the muffler outlet.
So if the DC header terminates at about 60mm, a 2.5" mandrel-bent setup would work nicely.
If you go custom built, I'd recommend the longest perforated-core resonator that will fit between the cat and the point at which you're forced to turn right and go around the petrol tank.
And unless you want to be on a first-name basis with every law enforcement officer in your city, definitely stay away from the canister-style or N1-style mufflers.
Welcome to the board. :cheers: