Getting ready for a Whipple install. I have Mak cat deletes Id1000s Bap Lund tune big Whipple body and dual fan intercooler. What pulley to select because of the cat deletes should I go down one size from the stock 3.75 to make 11psi?
Return partially to stock so it will run NA with stock tune. See if the problem is gone. Then if it's still screwed up pull the intake off for inspection.