07nbcowboy06

if i put a compund turbo on my 98 12 valve do i have to use a different exauset manafold for the turbo's?

BigErksG2

no, most of the time you turn your stock manifold upside down and it makes the top turbo higher to make room for the bottom turbo

j-fox

It is advised to get a three piece one that won't crack. You will also flip it upside down. This raises the secondary turbo for room under it for the primary.
you can use the stock manifold if you are short on money.

RowJ

Or at least an 01 or 02 stock manifold. Lots out there in the $100.00 range and the metalurgy is stronger. None have cracked that I know.

RJ

Diesel Doc

24vlv manifold will not work on 12 vlv. The 24 has round ports the 12 has rectangle ports.

logskidder

Die grinder and they work just fine.

HOHN

Be sure to rig up some kind of brace for the bottom turbo-- hanging all that extra weight from the factory manifold alone is ill-advised. It's not only heavy, but has a pretty good lever arm against the head and creates a lot of stress on the manifold and the fasteners that connect it to the head.

jh

07nbcowboy06

thanks ya'll i well look in to every thang but i plan to keep the 12v head and just oversize the pistons it the head to draw more air any way thank ya'll a lot