It also depends how you treat your car, maintance service etc, an the way you drive, if you get on it every so often , or drive the shltt out of it every day , depends how long that motor last....400 like mike said max but if it was mine I would push no more then 250 daily thats me , up the boost once in a blue moon to around 300-350 max , thats me b/c I take care of my shltt
this guy knows what he is talkin about good job bro i like your idea