Ok I'm going to say something that is true, yet to every other L27 owner its FALSE:

My car could easily handle a 90 shot.

Lets leave it at that.

How big of a shot all depends on your motor and tranny. Obviously if your motor and tranny are weak you arent going to put a 100 shot on. AQlso find out from the company when they tell you its a 75 shot wether or not that is true horsepower to the wheels. But dont forget though you could put a 75 shot in and & get more power by tuning it. Ive had friends that put a 65 shot in and got close to75 horses to the wheels from proper tuning. Definently get the proper stuff. I would do your research before just slapping on a bottle & pressing the button.

would a zex pontiac kit work that looks to be the most affordable

Is that also including you plugs, gauges & other things needed? I personally like the Venom VCN-2000. But its 2 grand. But the options that you have for exactly choosing how much to spray or even how to spray it is pretty impressive. But they dont have a specific application for our car. But the next kit I would go with would be Nitrous Express. Theres really no rush to get it now, so maybe by spring time you could have enough money to get the NX kit. But if you do go with Zex dont get their spark plugs. I havent heard to many good tihngs about them. Oh almost forgot. You know if you get pulled over and the tank is hooked up you can get in some serious sh*t.