i emailed warpspeed about B-Pipes for 4th gens and they wrote this

Eugene:
We might consider one for the Gen 3 Maxima's only, they would be 2-1/2" diameter with or without resonator. They can have any 2-1/2" or 2-1/4" center inlet muffler attach to them (we include adapter if needed for the 2-1/2")
muffler clamp, gasket and hangers included.
Not sure on the pricing yet, would need some numbers.
We also have 3" B pipes for the Gen 3 available.

regards
Dallas


so i guess not for 4th gen but you 3 genners are lucky. so if you need b-pipe GD make a new thread or use this one and make a list, but you will have to contact warpspeed yourself. i will not do it, i have no time right now with college just pick some1 to do it from 3rd gen ..........