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A friend of mine that runs a 7 sec true ten five n/a combo has a shop with a chassis dyno.He has tried everything and said on a car like yours a h pipe makes more power.Now on like a mustang or a car that runs 11 or 12's he said a x pipe has made more power.hope this helps.
I would say that his data was with some type of muffs
(with the 11-12s car) which again is a back pressure
thing... I like the H-pipe myself but it has to be
up close to the engine(primaries) to be efficient
Both his test were with muffs.He has to run them in the class he runs.
3120lb, small block, 10.5" tire, NA, through exhaust, full int, WITH 83/4 REAR, 9.0 at 150mph
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