0Mike @ CMS

So we have all seen good numbers made with the FAST 102 intake manifold and 102mm throttle bodies, we wanted to see just what kind of difference there is between a stock 90mm and a 102mm. Our friend Chris was nice enough to be our test subject. He brought by his 2005 Pontiac GTO A4.

4.125" bore x 4" stroke 427ci
West Coast Cylinder Heads Stage 2 LS3 heads
Ported Fast 102 w/ stock 90mm throttle body
Comp Cam 235/243 114+3
1 7/8 Headers w/ custom dual 3" magnaflow exhaust
Prototype Over the radiator intake
Tuned by Ryne with HPTuners in speed density
Xtreme Transmission built 4L65 w/ 3600 stall converter

Converter was locked during dyno pulls.

Pink= stock 90mm throttle body
Green= 102mm w/ Prototype over the radiator intake
Red=102mm throttle body w/ Halltech M107R Air intake (corvette intake)

Red :We picked up 11whp and 20wtq from a simple throttle body swap and Halltech M107R air intake, being that this car is tuned in Speed density, the additional air flow is clearly recognized by the leaner A/F ratio. Obviously the Halltech does not fit on the GTO we installed it simply for comparison.

Stage Runner

Very informative.........thanks Mike

90droptopp

Thanks for the dyno time. Neat little comparison.

skyavonee