I ran GRP's all last season and at the beginning of this year some stock-tuned and some modded. I just recently started trying out different engines. I bought an OS speed and took some advice on here and put a Mugen 2042 pipe (this is an OS 2060 copy) a Mugen L shaped header and installed an EB mods head button and all I can say is wow this engine puts all engines I have seen to shame. It has tons or torque, smooth controllable power and gobs of horsepower. I recently tried out a modded GRP .28 and that engine was insane but really ate through the gas. I think my search for the magic combo in my 8T 2.0 is over the OS as described above is perfect. I dont need or want any more engine. Ohh yea I'm using a 6.5 restrictor and getting an easy 10 mins.