You can bump your timing up a couple degrees at a time listening carefully for detonation. Usually 12*-14* works good.
Remove the intake air silencer from the passenger side fenderwell.
Remove the a/c if you have it.
As far as pollution equipment goes just leave it there because the eec-iv in your car won't run properly without it and it won't hurt performance.
Remove all unnecessary weight from the car. I know it isn't free horsepower but it will have the same effect.
Move the battery to the trunk.
When you bump your timing, run premium fuel. If you bump it while running 87 octane, the point where it will knock will be a lot lower. You can usually get 5 HP to the wheels from this. This is free except for the $0.20/gal extra cost of the fuel.
Remove the air silencer in the inner fender, and replace the filter with a K&N style. This should get you another 5 HP or so to the rear wheels. Ripping the silencer out is free, but the K&N is around $40.
From here, you are going to have to start spending money to upgrade.
The air pump is not really costing any HP, so you may as well leave it.
Do what they said, but I did have a comment about the air pump.
No it really doesn't gain much HP, but I just removed mine because it really cleaned up the engine bay. I mean, getting to some of thoes spark plugs back there are a real PITA. My car runs the exact same with all the smog stuff removed, didn't hurt my car at all...
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