What the main question is is "How fast do you want to go and how much do you want to spend?" If you have a good sum of $$$ and are like me and want stupid amounts of HP 500+ you want to go with an s-13 black or red top. The VVT it the s-14 engines fails over 400 HP. Granted many have built 400+ motors and haves destroyed the valve train but do you really want the headache. The s15 motor hav a more refined vvt that is stronger but the 6 speed trans isn't the best thing in the world. So you have to think how much horsepower, how much $$$ as well as daily driveability. If you plan on keeping the motor pretty stock do an s-14. If you nuts like me get an s-13.
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