I just got my syclone about a month ago its # 2789 a Saudi version. It has a built lower end, Vortec heads, I was told it has a T-45 hybrid turbo on it set at 12 psi. Previous owner claimed he has spanked a Viper red light to red light with no tuning done on it. Ive had a performance truck in the past but these turbo motors will be new for me. I always wanted a Syclone and now I have it. I want to tune it so I will asking for advice in the future.