they come with twin turbos from the factory. alot of people switch them out to single turbos for more speed and to reduce the heat in the engine bay caused by having twins. for FD help post in the "japanese, then mazda section" on here. alot of people can help you with mostly anything you need. also Mike *Five Star Tuning* can work on the engine if you need help in that area. also join www.rx7club.com. hope this helps. Oh. dont worry about the reps. Its not like i can buy a pb&j sandwich with it, lol