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Originally Posted by SteveR
Well, the first thing would be that the turbo would be taking hot exhaust gas and forcing it into a supercharger
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wrong. a turbo uses the exhaust gases to spin an impeller that compresses the incoming intake air. it does NOT put exhaust gas back into the engine. the EGR system does that.
twincharging does have some benefits. the best setups i have seen are similar to twin-turbo setups. the supercharger is used for off-the-line power, and once the turbo spools up, it switches over to the turbo for high-RPM power. the supercharger uses a clutch to accomplish this.
twincharged systems are hard to tune, though. HKS makes a twincharging kit, which is top of the line, but even then, it's not easy to tune properly.
twincharging is extremely rare, and when done properly, can make heaps of power. it wouldn't be my first choice (i'd go with a twin-turbo or big single turbo) but it is unique, and will get you a lot of looks.