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well i want 500wrhp
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Stillen would be extremely hard-pressed to reach that.
Vortech might reach 500rwhp, it seems like it could at least.
ATI Procharger might, it also seems like it could.
Turbonetics can.
APS single turbo can.
APS TT can.
GReddy TT can.
Power Enterprise might.
HKS S/C might.
JWT TT might, verdict is still out...
Price limit?
IMO, your cheapest options are the GReddy TT with upgrades, APS single turbo, ATI Procharger, Vortech, and Turbonetics.
You're going to need to do internals for over 450rwhp IMO.