you want to put the nozzle in your intake duct if you put it in right at your throttle body it might not spread to all of the cylinders correctly.--------you pretty much have to put it in your back seat floor--you have a hatch right??---you should retard your timing 2deg for every 50hp over 75hp-- so if you run a 100 only 2-4deg probably only 2deg will do. pressure could depend on what all you have done and youll probably have to play with it for a while before you find the best pressure. -with a 100 shot you should run colder plugs the regular(heat range) ones will last for a while but not forever. on 100hp jets you should see at least 85hp to the rear wheels if less something is wrong.. i think NOS says their kits are within 5% of advertised horsepower but youll have to find that out for yourself. ---------- try posting this in forced induction also--maybe there will be more people there to give you advice..?