Agreed, and it woln't even come close to taking advantage of the head flow available.
As far as the dual pattern vs single pattern vs reverse pattern, over here in the Street section it's not much of a player, as more times than not the car will have a full length exhaust system and head pipes not large enough, as is the case here.
These 455 will absolutely LOVE 3" head pipes vs 2.5". We've seen 2-3 tenths/2-3mph improvement at the track with vehicles we've been involved with here that had stout 455's in them and the owner upgraded from 2.5" head pipes, to 3" pipes with an "H" or "X" before the mufflers.
In contrast, we've tried just about everything behind the mufflers from 2.5" full length pipes to 3" "turn-downs" and it makes little if any difference in ET or MPH, so basically once you get that far back the hot gasses have condensed enough it really doesn't matter much how big or how long the tail pipes are......FWIW.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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