Just how much faster....

[SleeperGT]

Owl - Unless you go supercharged or nitrous, a chip isn't going to do too much for you. Without a power adder (sc or nitrous) a chip really only makes a difference if you have an automatic, which you don't. For all the mod's you've listed ( computer, pulleys, 3.73 gear's, h-pipe, and a K&N filter), the gear is going to make the single biggest difference which you will really feel seat of the pants driving around town, with 4.10's you will notice a huge difference. Everything else you're not going to notice unless you go to the track, and at the track the single biggest item to improve your times are drack slicks and practice. If money is no object definitely have fun doing all you listed (you'd be better off just going supercharged with all the money you'd spend in my opinion), but if money is any consideration do gears first for real power (about $500 to $650 fully installed with speed cal), just mufflers (about $200 installed) for the sound of power, and then a separate set of rear wheels with slicks if you are going to the track. As far as your question concerning reprogramming after your mod's.... when you have the gears put in you will either have to have a speed cal installed (about $100 installed) or have your computer reprogrammed for the new gears to fix your speedo. Reprogramming the computer after mods is best done with a dyno tune, and without a supercharger a dyno tune really isn't worth it for all the mod's you's have to do to make it worth while, and then you still would only possibly gain 5-15 rwhp because of the dyno tune on a non-sc car. And you aren't going to feel that kind of gain around town.