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Old 05-23-2015, 01:13 PM   #5
Cooks ZL1
 
Drives: 13 Camaro ZL1
Join Date: Apr 2014
Location: Maryland
Posts: 145
Also with your stock injectors being maxed out that's probably as far as they could take it. Seems about right. A 10%lower isn't much of a boost increase. I would add a 2.55 upper and port snout at same time, Id850, and some 200 cell high flow cats. You would see a nice increase. But 550 with those mods on 91 is about right.
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