I want to upgrade the factory H22 Throttle body, but how much larger should I go, and still be classified as mild. I still have all stock internals, and plan on leaving it that way. I was thinking of a 65 mm over the stock 60, but some people say I should go as big as 68mm, what do the rest of you think?

 

hmm, it's not gonna make too much of a difference, unless you do all the headwork, because getting a bigger throttle body will just create a airflow logjam somewhere else. If you're gonna P&P, get cams, new intake manifold, or even something like up your comp ratio, then getting a TB would help but on it's own it's prob not the most efficient mod.

what else have you done to your car? bolt-ons? suspension? brakes? wheels/tires? what will you eventually do to your car? some questions to ask before you go ahead with this.