Originally Posted by Sharif@Forged

A Greddy true dual 2.75 incher would be ideal for FI. Easily will handle 650-750whp if needed....same type of designs we've used on the 350Z TT.

A 2.5 inch true dual, while not optimal, would be perfectly happy in the 450-500whp range, but more power will always be available with a slightly larger exhaust, at just about any boost level.