There are several turbo kits available, either through major Supra tuning shops such as Sound performance, Toyomoto, Powerhouse racing. Or a common cheaper kit is the F-max kit. All of these kits exceed 300 hp. and no one really knows how far an NA can be taken. probably an NA can handle high triple digit hp. done right. But since your in Indiana, I'd look into Sound performance in the Chicagoland area. good luck