twin turbo

used to make small engines VERY FAST...mazda rx-7 has a 1.3 liter engine with two turbos...300 HP easily toyota supra golf GTI biturbo mitsubishi 3000 GT VR4 nissan skyline R-34 all can achieve ungodly HORSEPOWER (torque is hard to get b/c it is still a turbo) with about 20,000 in investing very expensive to buy and maintain, not made anymore in US