Custom Tuning

Select transmission option. NOTE: WE DO NOT DO SEGMENT SWAPS. If you swapped from 4l60/70e to 4L80e, you must use our plug and play harness, OR already have the segment swap completed.

Please select your shift firmness (94 & newer automatic transmissions only). 0 is no change (stock). 1 is a slight increase over stock. 2 is what we recommend to most folks, it is a firmer shift than stock without being too harsh. 3 is a very firm shift.

This is for the shift PATTERN (upshift & downshift timing) only, not how firm it shifts. We can either apply our tuning to it (recommended), or leave it alone if you prefer stock shift tables. (94 & newer automatic transmissions only).

Please select the octane of fuel you will run with the tune. You will need to be running this octane at the time you install the tune. If your vehicle calls for premium from the factory, then we highly suggest running premium. Highly modified vehicles should also run premium (i.e. heads/cam/bolt ons). Generally, the higher the octane, the more performance we can obtain out of the tune. If your vehicle is stock or lightly modified, we will still see good results out of using regular.

If you have installed a GM E85 Flex Fuel Sensor, let us know here.

On 1986-1988 Tuned Port motors, we can delete the cold start injector if you select "yes".

This only applies to vehicles with Displacement On Demand (i.e. 5.3L Envoy/Trailblazer). Removing DOD generally doesn't hurt gas mileage. Some customers with an aftermarket exhaust prefer to have it disabled so that the tone of the exhaust does not change greatly when it turns on and off.

Most vehicles have a speed limiter around 100mph. We can remove this limiter on most vehicles.

Please let us know what thermostat you are using so that we can adjust cooling fan temps accordingly.

Skip shift is a feature on some manual cars that forces you to shift from first to fourth gear. We can remove this on most vehicles.

Whether or not you tow lets us know how much torque management to take out of your tune. If you are not towing, we can remove more. If you do tow, we still remove some, but also leave enough to help transmission life.

If you have purchased an electric fan kit, we can patch your PCM to either control them (99+ V8 Truck/SUV, 08+ H3/Colorado/I6 Trailblazer), or delete the fan codes (02-07 I6 Trailblazer, 04-07 H3/Colorado) that may pop up when installing an electric fan kit.

If you are using a timing retard box to pull timing for nitrous, select Yes. We will NOT pull timing in the tune. If you are not using a timing retard box, select No. We WILL pull timing in the tune to account for nitrous.