ironically, megan used to be one of the "shitty ones."

btw, the crossmember modification on a prospeed isn't that big a deal at all. take a BFH, hammer away at it a little, and it should give you enough clearance. also keep in mind that kteller.com is selling the same header design (made by the same guy) that might have better clearance.

as far as the ideal bolt on setup you want:
good header, let's say a prospeed/rage/kteller (all the same thing)
2.5" flex pipe
2.5" high flow cat from random tech, carsound, or magnaflow (straight pipes or ebay high flows are asking to fail emissions, and bad for the environment, and trigger CEL's)
2.5" custom exhaust

tune it with a VAFC, or if you want, a hondata if you're planning on more mods.

with that setup i think 190 whp is very realistic. 210 whp with cams.