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Hennessy American Racing Headers give you 30rwhp without a tune, recorded 50rwhp after a tune. That's a hell of alot of power for just adding headers alone, not counting the exhaust. Add an exhaust, and intake and another tune, and you'd probably be close to 400 rear wheel.
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S.I.M. SS(L99):
*American Racing Headers (LT)
*Magnaflow cat-back competition exhaust
*K&N typhoon CAI
*Aggressive cam.
*Tune
**Result**: 465rwhp/ 447rwtq. Satisfied.  |