i have a J's 70rr stainless that i had just received in February after waiting a year and 3 months to get. well i now have a IP stage2 turbo kit waiting for me at home. my question is will the J's have enough flow or will i have to sell it and step up to a bigger exhaust? if i do step up what do you recommend?
thanks,
Blake

 

A 70mm Is ideal, and with a turbo it'll be a bit quieter.

 

Switch to a bigger exhaust for sure.

 

how much power are you looking for? what fuel? what turbo?

 

im looking for 500whp 93octane and using the borg warner s366

 

you are going to need all the help you can get, and i doubt you will actually hit 500whp

 

It should be fine for about 400-450 but for 500 you will probably want to step up the diameter. I know my j's 60rs flowed the same as my asura 3" at 9psi (not to much help for your situation). I say keep it for now and give it a shot because that exhaust is awesome.

 

i agree i love my exhaust and i waited forever to get it. unless i find someone to take it off my hands then i may just stick with it. the thing really is a work of art.

 

if thats the exhaust you've been wanting, i say keep it, a few horses wont hurt you

 

i mainly worry about the exhaust doing damage to the turbo if it has too much back pressure coming from a 3in DP to a 2.75in exhaust. im still kind of a turbo noob so im just trying to do things right without damage. my bank account will appreciate it if i do it right the first time lol.