Guys, I hate to say it, but I do believe the OS speed TZ has the evo 3 covered. we ran them back to back this weekend at the Latemodel summer nationals. we tried gearing, clutch set-ups, and pipes. in every conceivable configuration the Speed TZ was smoother through the power band, easier to tune and was able to run cooler temps and still rip harder down the straights. The skyline VR12+ is a great pipe on the evo 3 and likewise strong on the Speed TZ. If anyone has any ideas or anything they would like to see tested on a high grip dirt oval i'm all ears. Both motors tested were run on rocket science 30% fuel and both motors have had about 3/4 of a gallon of fuel through them.