i have currently have a b18c5 in my coupe with a stock exhaust.
i plan on going to the track to run my car and i dont think the stock exhaust will not be good. so i was wondering should i get 2.25inch piping or 2.5.
the motor is stock with juss an intake. what size would benifit me more? also i will prolly be putting a dynomax muffler on and i dont want it to be loud.

 

If you're staying all motor, I would suggest getting 2.25", if you're going boosted I would go 2.5"

 

2.5" for N/A, 3" for F/I (turbo)... That's what we roll... Latez

 

Since you are all stock---> 2.25" is good

But if you plan to do mods in the future, such as cams, pistons, etc...than I would recommend 2.5" piping

 

i agree go with 2.5" then you will save money in the future, especially if you plan on doing more mods

 

well when u guys say plan on adding bigger cams and pistons..i see ppl with gsr swaps go with like 2.25inch. so i figure since i got the itr swap with better cams and pistons and things like that then 2.5inch should be better for me??
i dont really plan to do much to it besides a get a header better intake and a clutch.
i dont want it to be loud

 

Yea performance wise you will still be better off with 2.5"... We ran that on my friend's completely stock B16A '88 Rex... I mean stock airbox, header, ECU, etc... 2.25" will be quieter but I'm sure you would notice a little bit of a difference... If you plan on drag then maybe just go with 2.25" for being quieter on the streets then run open header at the track... I personally would just go with the 2.5", have it be a lil louder, and be a little bit more free flowing... It's all up to you tho, good luck!!!