Stop don't spend another penny on the car....

First is it a manual or automatic, it will be much harder to notice gains on the auto.

Second, suspension should be your first area of concentration...AFTER, I'll repeat AFTER, you make sure all the required maintnance items are up do date.

Third, RESEARCH, don't buy no name parts. Stick to Summit racing, the Tire Rack for your first looks at gear. Names like Eibach, H&R, Tokico, and Koni have been around for a long time you can't go wrong getting these brands.

Don't by cheap no name gear on ebay. A cat back will likely add more to sound then a seat of the pants upgrade for speed.

A good first mode, remove the resonator box and buy a fresh drop in air filter. Don't know how to do this, then www.helminc.com for the Accord shop manual is a key first buy....