I noticed that many people swap the GT intake manifold with the GTS intake manifold. What is the horsepower difference by doing this. Thanks.

 

its probably only 4-5hp but it flows much better. also, if you hook up the seleniod, you can make the butterflies open for the variable intake runners.

most people do this on FI'ed cars. its not really a worthwhile mod on a n/a car.

 

Wut do you mean by open up butterflies?

 

the GTS intake has variable intake runners. at high rpms, the butterflies in the intake runners will open, allowing for more air.