How easily does the LS6 manifold bolt up to the 6.0?

I can get one for less than 1/2 the cost of the FAST, and for a turbo the gains from a FAST don't seem worth another $400...

To be honest for the gains shown in 'that magazine' (Chevy Performance??) about $300 is all I'd be willing to spend on a manifold. Too much to gain from a cam or intercooler for the same price...

 

I thought I heard/read somewhere that our truck manifolds were comparable to the FAST? If so, that may help your decision.

 

The original article had an error in the graphs that made everyone think that. The corrected numbers showed that LS6, LSX > truck >= LT1 > weiland alum, but they were all pretty close. I think the FAST earned 427 hp, 425 for LS6 and the truck was 419.

I just want to know if its a straight bolt on or requires modification like the FAST. For $300ish bucks, I don't want to do anymore self fabs