Quote:
Originally Posted by RevNev
How I tested the airbox was comparing the GT4 race car air box components with the road car and it's all the same. That tells me the stock air box works efficiently enough to leave it alone  The GT4 parts list also tells us it has catless downpipes to confirm the primary cat delete likely does reduce the waste gate duty cycle and performs more efficiently than stock (catted) downpipes. |
Yes so far my data and dyno results point to oem modified with drops and air scoops to be the best of all three so far!