OneSickPony

I want to redo my exhaust for more HP (first) and better sound (second). From what I've read I need everything from long tube headers back for the most HP gain. I want to do this mod myself so I need brands/styles of headers, midpipe, and catback that will bolt together without any problems/modification. I don't have the cash to buy them all at once so im assuming I get catback first and then headers and midpipe second (since they will have to be bought at same time in order for proper fit). I was thinking about a ProChamber midpipe. Don't they sell the kit that comes with the straight pipe to replace the cats when you want to go off-road? anyway...please fill with your suggestions. THANKS!

Longtube headers:
midpipe with removable cats: ProChamber???
Catback/muffler:

Remember...i need them to bolt together with no problem. THANKS GUYS!