i had dougs 1 7/8" on my 455 thats dynoed 625. Ran it at the strip and then tried hooker 2" and gained nothing in ET. The dougs fit better and easier to put the header bolts in and tighten. Dont waste your $ and time going to 2" on a 550hp motor.Id be curious if you would loose any power with 1 3/4".
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72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007
(cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD
1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.45 @ 88.1 mph on slippery street tires.Bad 2.19 60ft.Owned since 86'
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