The modifications mentioned in these articles have significantly advanced since publication. Some cars actually have modifications to two chips and involve changes in up to four memory maps.
All 10-valve turbo computer modifications are 50-states legal with the California Air Resource Board Executive Order No. D-238. All other computer modifications meet EPA Memorandum 1A requirements and are legal for use in 49 states. 1.8 liter turbo modifications are also now available.
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