hids are pretty cheap depending on where you get them
ddmtuning.com has them for like 50 bucks i have had a set in my cobalt for 2 years no problems. i have a set in my mazda going on 6 months no issues
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if you are going to supercharge dont worry with the injectors, or even the bolt ons on would just be patient use the money you have to buy QUALITY parts for the build. it will last longer that way. see my build thread for alot of info