Stock, the LS9 has 10.5 lbs of boost. This is the most conservative / least aggressive pulley at 2.6” diameter, which raises boost to 13 - so pretty conservative 2.5 lb increase. Lingenfelter consistently sees about 40 crank hp with this pulley. The other ponies are the result of the LPE snout, which is a bit larger diameter, but offers a significantly straighter path into the supercharger. Both pieces on a car with stock manifolds and full, catted exhaust are good for the advertised 710 number.
The guys at HOB think that the headers and 3” De-Catted exhaust, should be worth around 25 peak hp with the bigger snout and smaller pulley. We shall see!
Last edited by PDC; 12-08-2021 at 08:15 AM.
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