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Superformance Exhaust
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06-26-2009, 10:30 AM
jwoodard
Senior Club Cobra Member
Join Date: Aug 1999
Location: Carlsbad, CA
Cobra Make, Engine: Previous owner of SPF#1938, with a Keith Craft 496ci Genesis 427 side oiler, 667 FWHP, 633 FWTQ, 560 RWHP, 550 RWTQ.
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I don't know about picking up 100HP on top, but you will certainly reap a gain in RWHP. I changed the side pipes on my SPF to a set I built using the Howe Racing mufflers, 3 1/2" I.D., and Hooker Headers merge collector and netted 60 RWHP gain over the stock set up. That's on a 496 c.i. FE motor.
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