A word of caution ...
Upgrading the Vortech Impeller Upgrade to SI trim and then combining it with the Stillen 9 lb pulley can give you too much boost for a stock 11:1 motor.
Thats what I did ... it produced 11.9 lbs of boost @ 6900 RPM ... 483 whp : 378 tq.
The motor didn't hold together very long ... blew on the first 1/4 mile pass.
Am now in the process of having the long block built ... an expen$$ive le$$on
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