Have you adjusted the timing? Timing can effect how a car responds on the brake a good bit depending on your converter. In efi live there is a boost ve table and boost timing table that I use. Im not sure but I dont think HPT has those tables. I'll look tomorrow and see if they do.
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1999 Z28 Camaro|Cut up
2003 CC Duramax Dually|19.5 w/245/70/19.5|5in exhaust
2009 G8 GT 408hp/402tq sae|Rotofab CAI|LS9 Cam|Headers|GXP Mufflers|Custom System
2009 Tahoe stock
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