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I'm watching a 2650 struggle locally. Frying plug wires, diff cant handle the power, melted harness wires throughout the car etc. Heat from the headers appears to be a huge issue but heat throughout the entire exhaust appears to be a problem. His cats were also destroyed - maybe even when they dyno tuned.
The only way I'd consider a project like this for the track is going with a shop that can show you a reference that's doing what you're looking for in a track setting. Im not saying dont do it. Im saying make sure you find the right shop to help you work through all the problems. There are more then a few. Its not as simple as just solving fueling.
Note: my stock zl1 1le w/ just a7s was a second faster then the 2650. He had effectively one lap for two days.
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