03 mach 1 dohc nitrous
 

i have a ? i am running a 75 shot on my mach 1 right now with no tunning can i move the shot up to a 100 on 91 octane with no tunning and will it be alright ?

you'll never find someone to say it's ok with that little info. If you have colder than stock plugs and your existing tune pulled some timing for the nitrous then it should be fine. You need to read the plugs and watch for detonation anyway. The 25hp difference should be minor but you really should toss it on a dyno and watch the AF ratio after the jet upgrade.

You can run a 100shot on these cars with a bone stock car. The tunes from Ford are very weak and the fuel system can support a 100shot. As long as its a wet nitrous system and you run 1 step colder plugs, there is no reason a 100shot isn't fine. Thousands of cars on 100shots.

My buddy has a 100shot on his 99 cobra and has been running it for about 2 years with no tune. Like stated above just get 1 step colder plugs and you will be fine. You are always taking a chance with a power adder.

will i am being told to run a autolite AR92 sparkplug bye Autolite they say dont change the gap b/c it comes stock gap at 25

I don't know what plug that is. Ngk TR6 plugs (part number 4177 at parts stores) or Autolite 103's are copper and one step colder and work great. You will need to gap them down to .035"