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964 factory cup chip
i recently purchased a chip for my 90 C4 that is suposed to be a factory "cup car" chip. The number printed on it is "1964355189". Does anyone know if this is truley a factory cup chip. Also what performance gains should I expect? I already have a cold air intake and primary pipe bypass that I'm very happy with and plan a throttle bodie upgrade. Thanks as always for your help, CB!
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