35 rwhp gain with mac midlengths over stock manifolds
#5
8 Second Club
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I switched from JBA shorties (no better then stock manifolds really) to MACs with cats and picked up like 50rwhp back in 2001 with a P1SC/2000 z28 (476rwhp)
FWIW I switched to a set of FLPs LTs and didnt pick up anything, the MACs work pretty well on milder FI cars and you cant beat the fit.
FWIW I switched to a set of FLPs LTs and didnt pick up anything, the MACs work pretty well on milder FI cars and you cant beat the fit.
#6
10 Second Club
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Join Date: Apr 2003
Location: Surf City, NC
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I have the Macs too and when I added an OR Y-pipe I gained like 21 rwhp and 12 ft. lbs! They do pretty good! Some people have doubted them, but a buddy of mine switched his over from Macs to Hookers and his dyno looked the same and the car ran the same times!