Thinking of upgrading my cat-back exhaust. Is the GXP exhaust bigger (2 1/2"-3") then the SSEi, would it bolt right on

It is bigger and does bolt in place. SawGunner put GXP exhaust on his SSEi so he can give you the complete details. He posted a video of it in his one thread of how it sounds.

get with me at Bills this weekend and you can see and hear it in person

SWWEET--I will see you Sat. Is it 3"?? I got a 3" downpipe w/ highflow cat wanna do 3 all the way!!

it is 2.5" the SSEi exhaust is 2.5" from the down to the front of the res and then 2.25" the rest of the way back to the tips

there is really no need to go 3" all the way back the GXP exhaust is really good at flowing plus it sounds deeper than the SSEi one. all you have to do is cut yours off 3" behind your res and the GXP will slide right over it and weld it on

Sounds good, cant wait to hear it! Hope'n that Bill will help me put the DP on Sat.

I also got a 3.4 mps come'n in a day or to, what upgrades do I need to do before putt'n it on??

auto lite 104'* 180* stat. FWI at least that'* what i put on with mine