i`m swapping an ls/vtec
b16 head
b18a block
y1 tranny
arias 12:0.1 cr pistons
oliver chrome moly custom made rods
all parts balanced
stage 3 crane cams
crane titanium retainers and dual springs
dc 4-1 ceramic coated header
ported and polished head/ intake manifold
gsr t body
type r oil pump
type r water pump
fuel regulater
jacobs electronics ignition system
and some more **** bla bla bla

my question is what size of exhaust pipe do you recommend me to use????
listed the mods so you can tell better...

by the way here`s my car but it doesn`t have the altezzas any more (old pics)

 

2.5 is enough.

 

two point five inch inside diameter