I would skip the neon srt-4 IC. If you are looking for a cheap used one that is highly efficent then I would go with one from and Isuzu NPR truck (large core), early Ford power stroke, or from a school bus. These are all high quaility very efficent IC. If you are going to the after market you get what you pay for. I have run a few different ebay IC with only one doing a decent job. It was a delta fin style.

Dan