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ENFORCER boosted HSV GTS Published August 27, 2015 Having already made over 700hp to the tyres through a 6spd auto, Mark’s HSV GTS has recently made the switch to a Turbo400 3spd. At a recent APS test day, Mark was hoping to run in the nines. The LS3 engine is boosted a 2.9L Whipple supercharger. Post Views: 47