well, you could put how ever big an engine that you want in it but it would take alot of modding. also it would be to much for the car to handle. you would be blowing gears like crazy. a direct drop in would be a OS cv-rx.18. lotsa power. If you want even more power, get a os tz.18. its enough power to be blowing you gears out but it would be alot of fun. you wouldent have to modd much for that motor ither. its a rear exuast port so you would have to buy a new header