Tire size has a small effect on gear ratio. Gear ratio isnt the problem here. HP production is. GET a good intake. Get rid of any bents infront of the maf, and put a K&N air filter right on the end of it. yes it pulls some hot air, but bends in front of the maf can screw things up. DITCH THE CHIP. Get to somewhere that can set your timing properly, it shouldnt be that hard.
I have a 4.6L motor, smog legal, stock heads/cams, and Im confident it runs very very low 12's.
Skyler
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2001 BMW M3 6spd
12.79@108
RIP
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1993 Notch w/ 98 4V 4.6 Fasttt...
-1989 Saleen Mustang #406-
12.32@109
-1999 Black Cobra Coupe-
JBA Shorties, Bassani Cat-X, Magnaflow 3", Pulleys, 85mm Pro-M, Ported Intake, Soild Rear w/ 4.30s, Tubular Front End, X2C arms, 13lb batt, few others.
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