Need advise on mac exhaust parts please???

[84_GT350]

That's the exact same stuff I've got and I'm pretty happy with it. The Prochamber sounds great. I've heard of a few people having trouble installing MAC stuff, but that's the same across the board...some people hate it, some love it. I had an exhaust shop install mine so I wouldn't know. The 20hp you're looking for kind of depends on your current mods...but that sounds a bit optimistic. If you're totally stock you might get half that. If you've got some other stuff going, maybe 15. If you've got an intake, heads, a cam, etc then 20hp isn't out of the question...but if you've got all that and no exhaust then that'd be pretty odd too.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s