Newb FI question

DEpointfive0

Depends if you're going turbo or supercharged.

If you're going turbo, have Tony at FI make you a 3" exhaust, while you're N/A you'll "make less power" than if you had a 2.5" diameter exhaust.
It depends if you believe a N/A needs back pressure or not.
Generally, the more you open the pipes whether it's intake or exhaust you lose a bit of low end torque and HP and gain it back on the top end.

If you go turbo don't buy cats, because I believe most turbo kits are text pipe or straight pipe set ups, I could be wrong, don't quote me.
But for supercharger you CAN use HFCs, you just have to realize you're putting more stress on them, they will get MUCH hotter and will probably break at one point causing a world of other problems...

Stillen does do Supercharger installs with their 2.5" piped standard exhaust, but I'd feel more comfortable with a 3" if I were you

Don't buy an intake, Motordyne intake manifold, underdrive OR lightweight pulley, and don't buy headers, they'll all have to be taken off and not reused in any way (you COULD use the Motordyne, but if you're going FI, the $500 you spend isn't worth the minimal HP it MIGHT give once you're hooked up. Same with headers if you go supercharged, the money and hassle isn't worth the HP you MIGHT gain)