I just went throught this with our Bull Run Racer which runs a LS3 with a 4 barrel TB. While it has to be tuned in Speed Density, it still seems to be the best choice.
Based on your sig your engine is a factory LS engine, use a factory ecm. The factory ECM is faster, smarter and les money then aftermarket. The aftermarket systems will require a additional ingnition box for the multi coils on the LS engine, the factory ECM handles it all inclusive. And if your running a automatic, you can use a factory trans controller also. Mucho less dollars.
But if you decide on a FAST or Accel, we are delaers. Guess I kinda shot my foot off on this one!
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Frank Serafine
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