If I lived within a couple of hours, I would look at cordes performance. They had a bolt on M6 car running lows 11s at 125mph in 4000 plus DA. You can find the car on here by user name “JonD” or YouTube
https://youtu.be/jDeTUaeOdVU?si=c4Dfc2h7YoqeKaid
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2022 Vivid Orange M6 LT1 - 2" ARH headers with cats and offroad setup (full system,), 3" ARH Pure Thunder mufflers, ported MSD intake, Soler 95mm tb, Rotofab CAI, E85 flex fuel, tuned by Jason@snackbartuning, Forgestar D5 18x8 fronts with 245/40/18 and Forgestar D5 17x10 rears with 275/40/17 summer tires.
Old car 2016 M6 SS - MSD intake, Rotofab, 2" ARH headers with cats, E85 with EFI Tuning. Best ET: 11.7@122mph
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