I told ya last night bob, it's 1.75" but no you didn't believe me.TheBlade said:Matt named it...its 1.75" stock
2.25" is a good upgrade size for performance for a nearly stock GT. However, if you get too small of a muffler for the 2.25" you will get alot more sound than you may want...
I used to beable to hit about a 120dB's pretty easy with the exhaust. If you go 2.25" then go 2.5" axle back into a 2.5" in muffler it sounds pretty mellow and deep.
(for improved sound...add a turbo as part of your exhaust system :wink: :lol: )