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Smell is not that bad if you on tuned right and in E85. Normally I would say regular high flow cats, but from my dragy testing and HPtuners log data, no cats all the way. It might not show much on the dyno, but it sure showed in 1/4 mile mph and 60-130 times for me.
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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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