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My 2000 made 16.8 psi with a 4lb lower & i think the 3.3 (not 100% thats right) upper whipple ships the 2.3 with. Truck also had a SBTB, Bassani high flow cat midpipe and Bassani catback. Stock long block that made 449 rwhp and 480s rwtq (crap tune).
 

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Sorry for the confusion, it will not be on a stock block. It will be on top of a mhp longblock. Im wanting somewhere around 20lbs what combo would achieve that?
8lb lower 3.0 upper puts me at 20
 
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