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This is a file written for your stock c15 550 acert to add more power. The file has had the fuel turned up 20% and added 1 degree of timing to wake up your stock c15 acert. This is a non delete. A good file for when you want more power but do not want to delete your iva system. Works great with your factory 18-1 compression and is built for your 550 injectors.