Hmm. I wonder how much variation there is in test data at low RPMs. The fabspeed charts do not show much of a drop off at low RPMs. The concern I have is driving around town - I'm would not be thrilled with having less HP for the majority of in-town driving. I realize this car is not optimized for scooting around town, but still, I'll spend more time doing that than on the track.We have also tried a set of BMC drop-in air filters, that showed ZERO gain. P.S. The fabspeed manifolds showed a loss in power and torque between 1800 and 2800 rpm, but in my opinion this is a speed range that doesn't matter at all.
- GT4 delivery in June.