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That's a pretty good time for being close to stock. My best time is pretty close to yours minus the 4.10 gears. My best is 12.94 @112.34 with just a varam and catback on an 03 M6
I think mid to low 12 is possible with just some DRs. Your times were to be expected with street tires and 4.10s lol. 34psi is a little high even for street tires.
lower the tire pressure in the rears next time and you can raise it in the front. thatll get you some better traction and mph. your mph is good, the time is just average, prob because of your 3/4 tank and poor 60 time. if you had 1/4 tank and had the tire pressures set right and got a 2.0 60 you would have been under 12.5 which would be impressive for the mods.
Id also consider long tube headers and a x pipe before a tune, you dont need a tune with what you have, get long tubes that's the biggest bolt on NA difference maker
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