I am 879 Lbs. Turbo engines are not for everyone but I have loved my engine. If I where to build again I would use the same engine. Don't get me wrong the 915 is a great engine, I just like the weight and power advantage of the EP912STI. At the power setting I am running I am around 160-165hp... according to Thomas's dyno. But....that comes with some risk. The advantages of the 915 is its turn key engine. It also has many redundancies built into it, but with that comes the weight penalty. If you want a turn key engine the 915 is a great option. There is some tuning and setting boost settings you have to initially setup, but I enjoy the ability to adjust the engine. I think I need 200hp now though