If your gonna do nitrous or any power adder I would do it right.
•Get some tr6 NGK copper plugs gapped at .035,
•you will need to upgrade injectors, fuel pump, size will depend how much duty cycle they will be at peak horsepower.
•And you can use datalogged email tunes are fine. Same as a dyno tune except you don't see your horsepower and it's cheaper.
•get a window switch, set from 3500rpms to redline, get a purge kit, and a bottle heater for nitrous kit, and you will be 100% safe.
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2004 Mustang GT 5 Speed
Full Bolt Ons
12.1 @ 117.9 (1.7) in 1/4th
7.6 @ 92.1 (1.6) in 1/8th