Best Exhaust Pipe Size

Well what do yall suggest for an NA Integra. Like in inches whats the best size to use. It seems alot of aftermarket cat backs are to big and you end up loosing critical torq, in the lower band.

2.25"

hmm aight thanks dude

lol oh yeah idk how dumb this question is but uh wtf is a glass pack? My friend was saying how hes gonna put that on his 240 instead of a str8 Pipe for the turbo set up. Idk wtf a glass pack is.

its used to supress sound.

It's basically a resonator, it supresses the sound a bit without taking the power away a silenceer does. A good muffler guy can also use them to "tune" the sound of the exhaust note, in this regard.

The piping size depends on the engine. My type r has a stock 2.5" collector on the exhaust manifold, so 2.25" is a tad small for it. For most everything else like b16a's, b18a/b's, and all the sohcs, 2.25" would be fine.