Stage 3 full porting for a GM TPI upper plenum which includes opening up throttle body entry for your choice of 52mm 58mm or single large mono entry, removing EGR walls behind throttle body with additional blending, reworking the IAC hump to a smaller shape for additional flow on the 85-88 plenums on the 89-92 the hump gets completely removed. Opening up all eight runner entries matching them for any stock, large tube, or cast runners that your using. Reworking and radiusing all runner entry angles as well as removing ALL walls/protrusions cast near runner entries

PRICE FOR FULL PLENUM PORT $280 INCLUDES 80 GRIT FINISH

TURN AROUND TIME 4-5 BUSINESS DAYS

CAN USE OWN PLENUM IF YOU DON'T HAVE OR WANT TO SHIP OUT

RADICAL PLENUM PORT WORK AVAILABLE TO YOUR HEART DESIRES REMOVING BOLT BOSSES LARGER SIAMESED RUNNER ENTRIES CUSTOM SET UPS CALL OR EMAIL TO DISCUSS

Professional Porting service for your TPI plenum that yields up to 10ft lb torque and 10 horsepower