Whats the best exhaust option for getting the most low-mid range? (x,y, or straight type) Im not sure what exhaust mufflers im going to run yet.

I would go with the H-pipe though flowmasters (either 30 or 40 series)

x pipes are supposed to increase mid and upper range so rule that out. You want low and mid range so you want more back pressure at low rpms, I think but loose it up high to make good hp. Maybe a y but im not familiar with them?

I like the Dynomax ultra flo welded ovals,,,a little on the noisy side with 3" pipes,but I like it :D