Is stock ypipe back actually good?? i mean is it restrictive??

 

the stock ypipe is junk, but the stock exhaust is actually pretty efficient

 

So would there be big diff on having stock vs aftermarket ypipe back with aftermarket catless pipe and ypipe? or just similar gain?

 

With hi-flow cats and a y-pipe, the only reason to really change out the exhaust would be for the sound and maybe to shed some pounds. I'm running that setup with the stock exhaust and am very happy with it overall.

 

so performance arn't big diff?

 

nope

 

okie,, then seems like i will stay with my stock ypipe back until i have enough for nismo catback then... since in Canada the Nismo catback is so much more expensive compare to US.