I'm looking into the GMR Single Street kit sometime in the near future and was wondering what kind of power you could get out of it with the T-67 upgrade on a basically stock ls1 (maybe some different valve springs), with the proper fuel of course.

 

I would call them and ask.

Based on kits with comprable design and that size turbo...550rwhp should be doable...anda little more with a bigger turbo.

 

Thanks RealQuick, I was hoping that they would make somewhere around that. I will give them a call and see what would be best for me in the long run.