witch one is better?
I'm going to use a 70mm TB

 

Well if you're going to use a larger TB, then you have to also get a larger intake. Well, you don't have to, but you should because you don't want to rob the engine of air....also, you should try to get a larger intake manifold. There's no point of getting a 70mm throttle body when you don't have a larger intake. vice-versa - there's no point getting a larger intake manifold when you don't have a larger TB and CAI.

 

between the two i would recommend a 2.5'' as diameter increases you lose torque. personally i wouldn't get one at all unless you plan on doin a lot more mods. dont get a bigger intake manifold, you will dramatically lose response and your car will be slow as hell. i ran mine on the dyno with a Aem intake and then ran it stock and it was better stock. you need your intake to be narrow because flow does nothing, velocity is everything and you lose it with bigass intake parts.

 

3"

 

injen cai