Porting upper intake plenum?
Anyone ported their aftermarket upper intake plenum? I know some guys at modular depot peaked 3 hp with the stock peice. Just wondering if anyone gained more with aftermarket plenums.
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98 GT 5spd
-PI Swapped, Mac Prochamber, Flowmaster 40's, Steeda UDP, 180* Thermostat, K&N FIPK
-Eibach Pro-kit
-FRPP 3.73's, Centerforce II Clutch, Pro 5.0 Shifter, UPR Cable and Firewall Adjuster Kit
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