SLP Programmer, Programmer, 1999-04 Mustang GT/2003-04 Mach 1/1999-01 Cobra PCM - NO RETURNS.

This portable, easy-to-use unit allows you to fine-tune a wide range of computer-controlled powertrain functions for maximum power (up to 20 hp, depending on application) and drivability. Manipulate shift points and rev limiters; correct your speedometer for non-stock gear ratios and tire sizes; boost transmission line pressure for firmer, more precise shifts; remove the factory top-speed governor; and more—all in minutes and at the touch of a button.