any horsepower mods for a 95 GP-SE?

Hey everyone I have been trying to get ahold of some horsepower add ons these are the only mods I can think of:

K&N (which I already have)
NOS (which they dont make a kit for)
better computer chip
shift kit (I dont think they make one)
anything else...?

I am wanting about 20-30 more horses or so
I G-Tecked my car and it ran a 17.74 in the 1/4 with 93K miles on the car (3.1 V6), it wasnt bad except for take off, any ideas?

Exhaust