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Originally Posted by rallystyle
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I bought a Speartech harness for my LS418 TVS 2300, but actually it was not tuned for a supercharged engine. (Speartech sent out a stock ECU, but it was still setup for a stock fuel injection). I had to hire Rich Gala from the former W2W to tune it. So, I suspect that Speartech is selliing a stock ECU with this harness. Also, you don't want to use a 6L80E, because on a 67-69 Camaro's you be forced to raise the tunnel for that transmission swap. (Well, my floor pans are rather detailed) Now if you use a 4L80E, it bolts right in the transmission tunnel without raising it.
When I talked to Brian Thomson last summer(builder of Stielow's engine), he said that ECU is ant-tamper proof, but here is a more recent article that sound promising.
http://www.streetlegaltv.com/feature...t-factory-efi/