| The stock turbo Z's that running below 12.4 are using race race gas and upping the boost. At the very least... They probably are running with a drag radial. Stage 3/4 is 13 to 15 lbs off boost on street tires on a drag strip is going to produce with a good 60ft time 12.8 at best. Race gas in a stage 3 z running 18lbs of boost is going to make things alot more interesting. Especially on drag radials thats the tricks of the trade.. Boost controllers - Yes Race gas - Yes The rest of your list not necessiliary... Hope this helps...

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