You get no HP gain from the additional flow UNLESS you use NOS. If you use NOS then, according to the guys at SGP, they've seen some REALLY nice gains because of the extra flow.
If you're not sprayin' don't waste the money.
Greg (Dallas) '93 SGP Stage IV+ Sapphire Blue TT '91 Stage VIII+ Metallic White NA 2+2 (DECEASED)