best size exhaust pipe

[MrDB1integra]

Hey guys just wondering what would be the best size exhaust pipes. I have a stock header(for now), no restonator, and a stock cat, and a apexi dunk muffler. The reason I am wondering is because theres no way im paying $500 plus for exhaust when I can weild myself. So yeah I was wondering what would be the best size. Its a GS sedan.

 

[guiltyxxspark]

2.5 inch is pretty good.

 

[Tam4511]

2.5 inch is pretty good.

x2
3inch for turbo

 

[guiltyxxspark]

Also make sure it's going to a good quality muffler. Spoon, RS*R, A'pexi, HKS, some Greddy.

 

[jznsn2u]

If you plan on only running intake/header aim for something like 2.25 - 2.36 (type r size).

 

[MrDB1integra]

Also make sure it's going to a good quality muffler. Spoon, RS*R, A'pexi, HKS, some Greddy.

I have a fart can on right now. I recently bought a apexi dunk universal muffler. Its going on as soon as I get my pipes

 

[MrDB1integra]

If you plan on only running intake/header aim for something like 2.25 - 2.36 (type r size).

I have a SRI.Tthe filter is right next to the battery. My intake is a cheapy. I just bought a $20 autozome pipe and k&n dry filter.

 

[j13]

i think 2.5 is to big for a stock engine. If it has a nice cam and its breathing more than 2.5 is ok. if i were you go with a nice header, catless, oem Resonator with full 2.36 or even 2.25 Piping.

 

[TegSox]

For a non-VTEC, if all you plan on doing is I/H/E, don't go larger than 2.38. Get 2.25 if you shooting for a lower end/midrange powerband. 2.5 would be too big.