Im getting new pipe from my Cat back next month. Was planning on 2.25", would there be any dif. to go with 2.50" instead? Would that be too large for the exhaust to flow efficiantly? Or would it be better?

i got 2.2 and well it seems great for me. people have to me bigger then that you will start losing lots of backpressure...

I would go for 2.25" since you're not running FI I assume.

go for 2.25 anything bigger and you loose backpressure, and power.