don't worry I'll send you some royalties, nobody messes with tb's on auto engines, its called blueprinting in the kart engine world where every .5 hp counts - I understand what you mean though

 

Get the 70mm unless you plan on getting a supercharger, then you can upgrade it to a 75mm.

 

10-4 to that.

 

Get the Accufab plenum and 70mm TB. Best power gains.

 

most plenums are very close in hp..accufab just has to be one of the most expensive.....what is the maf size on your car....

 

I believe it is 80mm...its whatever comes stock on 04 GT's...I think i saw somewhere it is 80 though...I'm thinking about going with the Pro-M 85mm MAF...would that help out the gains of the TB and Plenum?

 

if you went to any I'd go with a 2002 lighten 90mm it's a plug in for you ....they work great

 

where might i get one of those?? haven't seen a 90mm nor have i seen anyone on these forums using a 90mm...

 

I think pro-m has some.

 

I have seen dynos (many) that show the install of a plenum (C&L, accufab, whatever) around 5-10 RWHP. Then they swap out the 65mm T/B for a 70 or 75 and only gain 2-3 more RWHP.

The throttle body is not a very restrictive componet in a n/a GT, espcially one with no cams/head work. Whichver you buy will be fine, there will be virtually no difference in horsepower (although some people claim they feel a diff in "throttle response, probablyi just their imagination)