Our C7 Corvette Z06 EFX MAX Performance Package is the final level of bolt on performance upgrades. This is the package for the competitive driver looking to get every ounce of power out of your LT4 without internal modifications. This package takes our already phenomenal Stage 3+ Performance Package and adds some critical components to allow to stretch the performance even further. This system adds a DSX Tuning LT4 supercharger lid and Alky Control methanol injection system. These components yet again help with efficiency by helping control inlet air temp keeping the supercharger in efficiency range to run higher boost level and thus raising horsepower beyond our other packages. This package starts at $13,549.99 with parts, installation, and dyno tuning!