Mayhem has a 887hp 427 Supercharged LS engine that Thompson built. It runs on pump gas, gets over 20mpg with the ac on and does it making only 10 lbs of boost. Between supercharged and Turbo-ed I would go with the Supercharger. A much more linear torque curve. I own both. Most turbo engines have low compression and until you nail the throttle they feel underpowered. The Supercharged car makes it all the time.
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