Does the Apex N1 Turbo exhaust come in a 3" pipe?
What size should be the piping?

 

i think you can only get the muffler itself in the 3inch . They have a GT series whic are bigger. I think like 2.75, but Im not sure if they have Honda apps.
I had the Apexi N1 in 3inch and just got the piping from Kteller and welded it together