Bumper cut and not cut.
Are you guys getting enough air over you intercooler?
I even see in the latest GMHIghtech RPM is running there Camaro with only grille removed.
To answer the original question, yes, I saw plenty of cooling for highway runs during the dead heat of the summer. 3rd gear from 3000 rpm to top of 4th I only saw a 6-10 degree increase in temperature from ambient, which I don't think is bad at all.
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I'd say just keep it open and let the intercooler be visable.
