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Personal Shop car...
Went from:
1 3/4" Doug Thorley LT's - Picked up 41 hp
1 7/8" ARH's - lost 3
1 7/8" Doug Thorleys - picked up 1
1 7/8" LG's picked up 4
I'm sure there were some variances in the dynos those days too so take it for what it's worth.
Of all the headers, I really liked the low end of the 1 3/4" DT's. They showed more low rpm tq than any of the others I've tested.
Curious to see how the new Pfadt 1 7/8" Tri Y's will be but.....Im a believer of the LG Super Pros.
The quality and performance is second to none. My opinion of course.
I can tell you that any Long Tube will be better than stock manifolds tho.....prolly one of the single best things that you can do for performance on the LS3/L99.
Good luck!
Ivan
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