N2O, personally I believe the s-trim is better, because to get 10 pounds of boost on the ATI, you have to run 14lbs of boost thru the intercooler. Thus, this puts extra wear and tear on the motor just to produce the same boost as the the vortech without an intercooler. Also I have a friend who has already been through 2 head units with the ATI, due to bearing failure.
As far as 302 LX Eric said, that is true about the D1 prochargers dominating some classes. But, they are not running intercoolers on these superchargers.
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