I made my own harness from the donor LS3 car but I am now switching to Holley. I got tired of having to send off the ECM every time I wanted to change anything and I'm not technical enough to do my own programming. I am in the process of installing a Holley Terminator X for a friend of mine also and I like the Holley stuff. So far it seems to be well built and setting up the software was pretty easy. Most of questions have already been addressed on the Holley EFI forum. I've always been a fan of using GM parts but the programming is what convinced me to change. I'm still keeping the old harness and ECM though. Just in case lol.
Alex
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