Yeah weight reduction is a big thing. Lighter is faster, well somewhat. Someone once said in a post that running on half a tank helps because of the weight of a full tank. If you want to go all out, remove the whole interior except for what you need, like seats and crap. get lighter weight wheels.
Engine wise, take out the a/c, underdrive pully replacement with a lighter one, K&N air filter, free flow exhaust ETC...
The cheapest but probably hardest way to gain time in the 1/4 mile is to go on a diet.
-Rob
