i need to get rid of my cheap *** ebay 2.25 catback i am running cause it sounds like **** and i wantd to see if any all motor guys out there have ran 3in thermal catback on a all b20v all motor puttn down around 220hp or should just stay with the 2.25???my tuner said that i prob pick up more tq with the 3in vs 2.25 but not much hp and i thinks hes right but im sick of car sounding shitty and i know thremal is great company and comes out with great sounding exhaust but i dont want to waste money on the 3inch if i dont need it...

 

i would be surprised if you pick up any torque, usually larger diameter piping will get you more peak hp and loss of torque down low.

 

No net losses anywhere.

You'll be happy with the gains.

 

well if i was running a b16 or gsr i would prob loose tq but i think cause my b20v 85mm i might unleash some tq running the 3in but either u guys ever hurd the 3in TR catback on a b series??was it really loud??

 

You're N/A, so any exhaust is going to be loud. Having said that, I used to run a 2.5" TR on my B20V and it was loud, but not raspy. Go 3" all the way for sure. Then you'll be ready for boost later.

 

ended up goin with 2.5 kteller piping with a vibrant muffler on my rex..sounds sick

 

so what did you use for your cat? i have the same problem my stock b16 exhaust manifold id is 2.25' and i ordered the tanabe medallion touring which is 2.5' what do i do for the cat?