sledneck1

I'm looking into on of these manifolds strictly to make my turbo spool faster. I'm not really looking for anymore HP, would my money be better spent elsewhere or do they really make the turbo spool significantly faster?

Tate

I noticed little to no difference with my ATS. I noticed roughly 50 degree drop between the manifold and the straight pipe.

You could look into porting out the manifold to help. Looking at the gaskets, there is a good amount of material that can be removed. This is said to help spool up.

sledneck1

How does one go about porting your manifold? It must need to be 'tuned' is some way?

getblown5.9

I have an HTT manifold because my stocker had a big crack in it, and the only things I noticed were a slight drop in EGT's and at high rpms the motor just sounds like its breathing easier, hard to explain it just sounds like its not working as hard at high rpm now.

I ported the heck out of my HTT manifold, took alot of metal out of it. i did all 6 ports, matched to the gasket, then gasket matched the turbo flange to really open it up, and went down inside each of the 6 ports and smoothed all casting ridges etc that i could. took me about 3-4 hours with an air die grinder.