This is MAX level full porting and enlarging the whole runner tube on a pair of GM TPI runners to 38.5 inner diameter all existing dents will also be removed with this process. This is the best and only option if you want to retain the stock look of the original TPI runners while gaining power. This port job will outflow most all aftermarket cast runners as a 38mm ball passes through each runner with ease, with most aftermarket cast runners the cast isn't consistent throughout they also have large blockages for the mounting bolts cast into them that reduce cross sectional area substantially
Stock TPI individual runner measure 220cc flow 197cfm
Ported Stock runner measure 260cc flow 270+cfm
PRICE FOR FULL RUNNER PORT $350 INCLUDES 80 GRIT FINISH AND RETURN SHIPPING
TURN AROUND TIME 4-5 BUSINESS DAYS
CAN USE OWN RUNNERS IF YOU DONT HAVE OR WANT TO SHIP OUT FOR ADDITIONAL $100
CAN REMOVE DENTS FROM AFTERMARKET AS&M RUNNERS AS WELL AS EXPAND THEM EVEN LARGER CALL OR EMAIL FOR MORE INFO