85LSburb

iTrader: (1)

I have a lq4 with duel plane carb intake, FAST ez efi, smaller cam in it. I have factory manifolds now but i am about to order headers. What size pipes would be best 2.5s or 3 inch. Both will be duels. Both will be made buy local shop if it matters. thanks

butler

I ran 3" and no loss in power.

bwkmaro

are you gunna go further with the motor? id say dual 2.5 if not that will be enough flow

VandykeT/A

Use 3 inch. Leave yourself room to grow.

bww3588

iTrader: (49)

Also a good cross over.

85LSburb

iTrader: (1)

I will use a h pipe unless the exhaust builder can do a x. Is there any gains between h and x. I do plan to upgrade the heads one day then maybe a 421 short block long time from now.