01 Z28, is it really worth the money to do the 90/90 LSX and Nick williams swap. and if so what kind of power gains might i have.............thanks

 

Not with your current list of mods. I'd spend the money elswhere and make a lot more power if I were you.

 

You could take that money and do a cam swap/tune if you install it yourself. You've already got the LS6 intake, so your gains would be less than stellar.

Not worth it untill you've got at LEAST a cam.

 

I wouldn't suggest a FAST 90 setup on stock cubes at all. An LS6 intake is about your best bang for the buck regadless of mods on stock displacement. Strokers, on the other hand, pretty much require it to show their potential.

 

what about just a better tb?

 

port it yourself or get it ported at somewhere like new era

 

Use that money and get yourself a good throttle body and a cam.

 

whats the stock mm size of the tb, and would it be better to just port it or get a new one....thanks

 

x2

Just port it. It's cheap and more cost effective than a new one.

 

x3

 

stock is 78mm.everything i've read and after talking to jason says 90/90 after big cam or h/c swap only.

 

The stock is actually 75MM, not 78MM.

 

thanks for setting me straight.i thought i read on here it was 78mm.thanks man

 

I think your next mod for an a4 should be an aftermaket stall convertor.

 

its hit and miss with the 90/90 setups. if you have a big setup that really needs to breathe then ya, but an LS6 intake with a Shaner TB or any other ported TB is usually sufficient. Also if FAST would come off the damn prices and get their heads outta their asses it would be a hell of a lot better. For the price of the setup, you could get a set of heads.

 

Another + for porting your own TB and stick with the LS6 intake.

For the money you could do a nice cam setup and get much better gains, also get a stall it'll make more difference in SOTP and ET's than a 90/90 setup could ever hope to do.