I've got the MWR internals (weisco pistons, crower rods, valve springs, etc...see profile)... I went Turbo on my last car, and when I bought my GT I wanted something more reliable in case I wanted to drive a little rough in my GT...it seems to Rev a little faster (maybe just me), and I do have to use premium gas now too. if you are looking for tons of HP then I say go lower compresison and go Turbo. I drive track days at road atlanta, and stay at pretty high revs longer than just the time it would take to drag race. I got the new internals so I wouldn't have to worry about valve float, and would be able to stay faster for longer without worrying about my engine life.