Pull out the vacume tube at the top left of your valve cover (Ill give a pic if you cant find it) its the fuel pressure regulator vacume tube. If you got a N/A MP3 it should trick you engine into thinking its got 14.7 PSI instead of 14.3 PSI (14.7 being atmosperic pressure, & 14.3 being the engines) It will definatly suck down more fuel and make you run richer.
This is a Trick Ive recently learned from someone at the Drag track who say they got it from a tech, so its alot of hear say, BUT, from my own testing I feel more grunt, especially in the second gear grab, BUT I tried to city drive with her and she was alot less smooth going up the RPMs (Noticeably) And takes Alot more Gas.
So unpluging it when you want a little more kick, and putting it back when your normal driving. Keep in mind the gains are quite minimal, but aparent.
Its also something the ECU doesnt need to learn, its instant, so unplugging it at the track whe you race, then plugging it back in when you leave will work (as aposed to the ECU needing 300kilometers to learn and adapt to the change).
Im not a tech, so I dont know exactly whats at play here, But the way second gear grabbed (repeatedly while unplugged) was Sweet, and Gone when plugged back in.
