Since Ivan's GSR is no more. It made 178 whp and 129 wtq. I built the engine when I worked at Sunbelt. This was on a fresh engine with about 30 minutes of break in and dino oil. I still needed to do some intake and exhaust testing. I felt that there was maybe a couple more hp there. We were able to turn it 8600 rpm. It made peak power at 8200. From the few laps that I got to drive it it was like driving and ITC car. It was all about momentum. It would not accel up turn 1 at Road A in 4th. You need to be above 7000rpm all the time. This meant you had 100wtq. So the GSR is about a 20% power increase.