will a strup raceheader for an fg2 bolt up to a full race 3inch exhaust without the adapter?
The difference between a 2" collector and 2.5" collector can be significant, especially on a boosted setup. And the collector design also plays a big part.from my research most other headers have a 2.5 collector. cant be that much of a difference. if i get a 3in exhaust with the adapter it wont matter. lets say i got a header with the 2.5 collector, i still need the adapter.
^ exactly.The difference between a 2" collector and 2.5" collector can be significant, especially on a boosted setup. And the collector design also plays a big part.
Also, the skunk2 and Invidia collector flange is adaptable to a 3" exhaust...so you don't need the adapter with it.
I don't understand why you'd get a top notch exhaust and a cheap header. If anything, do just the opposite and spend more on a quality header. Headers make power, not exhausts.
The Strup header isnt going to give you 'significant' gains. No header will. Significant gains is like 25+WHP...i just cant justify spending 800 or more on a header. i think strup is decent. i think i would get more power out of the 3inch than the 60 or 70mm with the strup header. im sure i would see significant gains.