2.5 or 3ince exhaust

[eddgsiturbo]

im gonna start building my let nova soon and was wondering what would be the best size bore exhaust to go with, i will be gettin a 3 inch front pipe anyway but would half inch make much differance, engine spec is

stage 1 kkk
inlet cam
cometic head gasket
arp head studs
arp rod bolts
forged pistons
2.5inch boost pipes
eds phase2
eds 8.1ltr intercooler
xe flywheel
omp paddle clutch

any ideas? :thumb:

[blue_peg_16v]

2.5 is plenty big enough for that spec imo

[stt]

This website (http://www.mk5cortinaestate.co.uk/calculator5.php) is great for working out the size of exhaust you need!

[stt]

2.5" is good for over 250 bhp
3" will flow plenty for 369bhp

[david dixon]

i would recommend 3" for anything over 280bhp

David.