at the stage you're at with the car, a set of sticky tires and a good alignment will provide u the best bang for buck pleasure. however, i think i've mentioned this to you before, if thats the case, look into sourcing a GSR or B16 transmission. for the 500-700 dollars they go for used in good condition (Beware of shady sellers selling stolen parts) the return in better acceleration is awesome. the downside is that mileage suffers and freeway RPM's go up at crusing speed.