whats next

Im making my civic faster it has an injen intake and greddy catback exhuast what wuold be the next cheapest upgrade?

Oh yea its a 97 ex

bang for buck is def nitrous

nitrous, high flow catalytic converter, and tuned headers, nitrous will only get you so far... and if you plan to run more than a 50 shot (75 of 100 shot) get it dyno TUNED! your best bet to get it faster in the end is to get a turbo kit... or engine swap and a turbo...

What about AEM fuel rails and such. How bad does that make your gas millage?

search is your friend. if you searched, you would'nt use "cheap" ;)

http://www.automotiveforums.com/vbulletin/showthread.php?t=329163

AEM fuel rail won't do shit, unless you are running HIGH boost and need a larger capacity fuel rail for a stoich A/F ratio.. Seriously, you sound like a total n00b go read what other people have done, search around, go buy some magazines with DIY sections, and any of the many vehicle teardowns for your year, and model car. please go and see what mods actually add to the performance of your car, and what you can and cannot do... seriously talk though if you want gobs of power, and engine swap is almost necessary be it B16, 18 or H22. look up the qualities of all your mods... see how much money you have to work with and choose your mods wisely.. also use other peoples cars as a base to follow... you don't have to copy exactly what they did, but do some variations. Just please keep it clean... unless you are a sponsored driver/showcar, keep the stickers on your garage wall..