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you cant go wrong with either, I went with GPI , great customer service walked me through the HP tuner part ( computer literate ) car runs and preforms Awesome ! , don't forget to get the trans tuned too... ( extra expense) need to remove the computer and get unlocked from HP.
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DARK KNIGHT
2018 SS A8 11.37 @ 121.01 GPI Tuned E85 Nitto tires Roto Fab CAI MSD intake
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