when i ran stock it was 15.3 but on the same heavy rims and tires.
the mods i have for the 13 second run are:
3" full exhaust (no cats just a test pipe) and a flow master 2 chamber muffler
cool eeze full 2 1/2" innercooler piping kit and 3" suction pipe with k&n filter
hks blow off valve
lexus ls400 maf
aeromotive adjustable fuel pressure regulator kit made for mk3 supra (from e-bay)
stage 3 spec clutch and fidanza lightened flywheel
denzo iridium plugs (2 steps colder)
12psi boost (but it goes to 15psi under a 75 shot of nitrous)
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