Nick Vasquez and I have been doing some heavy testing. (More him) but we realized it's very easy to drill the 2 hole pistons to big. It took me 3 tries to get it right, a pilot hole with a number 55 is a must. And be very careful when drilling final hole, it's amazing the difference in the car when the holes are just slightly big. I was able to drop 5 wt in each end and it lands way better and is way more stabil