01TA

iTrader: (7)

how much will stock manifolds hurt a p1sc @ 5-7 psi.?

What kind of power will it put down with 10.5:1 comp. AS stg2 ported heads and a 216/220 114 cam WITH OUT headers?

allthrotle

iTrader: (2)

You really should get a set of headers if your running a supercharger. Your putting all that nice compressed air in you want to get those exhaust gasses out.

EPP

iTrader: (22)

You could be losing out on 30 rwhp with the parts you already have installed. You might see 420 to 430 rwhp on a Mustang Chassis Dyno. Bob

01TA

iTrader: (7)

'You really should get a set of headers if your running a supercharger. Your putting all that nice compressed air in you want to get those exhaust gasses out."

I have some now, but was thinking of going 100% california smog legal.




"You could be losing out on 30 rwhp with the parts you already have installed. You might see 420 to 430 rwhp on a Mustang Chassis Dyno." Bob


Is this because of the heads and compresion or the cam?

allthrotle

iTrader: (2)

Im sure you could still stay smog legal if you had it tuned after you put everything together. If the headers have a carb or e.o # you should still be good to go.

Redneck Z

iTrader: (3)

They are talking about LT's, which don't have a CARB#. The stock manifolds will definately hurt you quite a bit no doubt. A guy with a P1-SC told me that his boost pressure dropped 18 psi when he went from stock to longtubes. It sounds like they must have been a pretty big restriction. What about running the BBK shorty 1 3/4 shorty headers and welding a JBA or Edelbrock CARB plate to them? The 1 3/4 shorties would at least be better than your stock manifolds with boost. The 1 3/4's COULD be legal if BBK would have them tested like the JBA's.

EPP

iTrader: (22)

The heads, compression and the cam plus the forced induction all play a part into why the manifolds would hurt performance. Think of how the headers pick up power when added with a heads and cam package. Bob

b727pic

iTrader: (1)

I installed the JBA's on my GTO, lost a little over 1PSI of boost. But torque actually increased slightly. Added a blower cam and regained half of the lost psi due to valve timing. the JBA shorties definately flow better than the OEM manifolds....question you have to ask is the $$ worth the 10-15 HP??? I am happy with mine, and I retain my CARB compliance.