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Grok says it would most likely need to be tuned to see the gains. Without tuning, it would run slightly lean from what it says. Who did the tune? Who did you get to install your headers? I've found one shop in the houston area that is reasonable (Ace Performance Exhaust) but I'm concerned about getting it installed without leaks.
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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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