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Upgrade your pistons to change compression or install a denser alloy piston in your bored out HEMI for higher boost.  
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When considering supercharging your 6.4 HEMI Challenger SRT8 you start by scouring the internet for stories of boost and which supercharger provides the most power. The problem is that you see more stories of blown up engines and non-drivable new cars than you do happy customers. Now you can have your supercharger and peace of mind with Arrington Performance’s new Drop In Piston Package for 5.7 and 6.4 HEMIs. These pistons are good for up to 12 LB on a 5.7 HEMI and up to 12 LB on a 6.4 / 392... 
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Dimensions:15 x 15 x 12
Weight:15.0 lbs