apexi n1 catback question

hey all i'm really really sorry to keep bringing this up, but i think i may have found my problem... maybe not.

could you tell me:
* what the size of your tip is on your apexi n1 catback for NA car - is it 90mm (~3.5") or 115mm (~4.5")? (and let me know what car u drive too) and how about the canister roughly?

i'm basically trying to find out which muffler canister came with your full system.

THANKS!