Steeda Certified Mustang Custom Tune (1996-2020)

5 Review(s)
$40.05 (18%)
Own an SCT tuning device and want to have the most advanced, safest, most reliable custom tuning available on the market? Then purchase our Lifetime Tunes option and receive our Steeda Certified Custom tunes for your vehicle for as long as you own that vehicle and tuning device.

Part Number: 999 TUNE MU
999 TUNE

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Own an SCT tuning device and want to have the most advanced, safest, most reliable custom tuning available on the market? Then purchase our Steeda Certified Custom tune for your Mustang and maximize the performance of your vehicle. Steeda Certified Custom tunes pass our rigorous standards for performance, durability and driveability and have an impeccable safety record. Developed and tested on our in-house dyno as well as through hundreds of hours of field testing both on the street and some of the most demanding race tracks in the country, you can be sure our tunes will deliver safe, reliable power.

Custom tuning is delivered via email. Your tune will be emailed to you in approximately 7 days. If you are ordering separate products do not install your products that require tuning until the tune has been delivered.

Up to 90-Days for changes. Steeda will honor the two revision upgrade for 90-days from receipt of the initial tune. 

Note: Our program only covers the original vehicle owned at the time the customer entered the Lifetime Tunes program. New vehicles will require a new purchase of either a tuning device or a new Lifetime Tunes program purchase. Modifications that require dyno tuning are not covered by the Lifetime Tunes program. These types of modifications include but are not limited to:
  • Cold Air Intake
  • Aftermarket Camshafts
  • Aftermarket Fuel Injectors
  • Aftermarket, Non OEM Superchargers
  • Nitrous Systems
  • Major Engine Changes (stroker engines, compression changes, cylinder heads)
  • Crate Motor & Non OEM Engine Swaps
  • Race Fuels and Non Gasoline Fuels (E-85, Methanol, Alcohol, etc)

Warning: Not approved for sale in California or states that require a California E.O. #. This part has been designed and is intended for off-road application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations. Steeda Tuning will not change, remove or alter any emissions control devices on your vehicle.

Note: Federal and several state and provincial laws prohibit the removal, modification or rendering inoperative of any part that affects emissions or safety on motor vehicles used on public streets or highways. Steeda Autosports assumes no liability for any violations arising out of any federal, state or provincial emissions or safety requirements on motor vehicles arising out of the customer's modifications and/or use of Steeda products. It is the responsibility of the customer to determine if their modified vehicle complies with applicable laws.

This limited warranty is the only express warranty applicable to Steeda Autosports products. Other rights may arise or vary from state to state in the United States. Steeda is not responsible for any time for which you may lose the use of your vehicle, any inconvenience you might be caused, the loss of your transportation or any part thereof, or any other incidental or consequential damages you may have.

Product Benefits
  • Tested and proven on the dyno, street, and track
  • Improved horsepower, torque, and throttle response.

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Steeda Autosports

Vehicle Fitment:

Fits Model Year: 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020

Customer Reviews

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Average Customer Ratings


Blown away
Initially I was going through a different company. Them and I went back and forth trying to dial my 2012 gt in. I had flashed my car 40 times. Over the years it didnt occur to me how many revisions were happening. Was having a real issue with downshift clunks. Tried Steedas tunes. The very first one was better than any previous. No clunking. Chirping tires switching gears. Rides smooth. One revision later (due to some personal preferences) & my stang is running exactly how I wanted. Could. Not. Be. Happier.
Did you find this helpful?  3 of 3 Found Helpful
Great tune
2011 Mustang GT, automatic, 3.15 rear gear, 3 inch H pipe, stock CATS, resonator delete, Boss 302 mufflers with 1 internal baffle removed, ported stock manifold with heat shield on the bottom, Steeda cold air intake, 85 mm throttle body, SCT canned tune, car ran well but not spot on. Purchased a Steeda tune, tune was 100% improvement, throttle response is great, good mid range response, improved transmission shifting, strong wide open power, 1 mpg increase on 93 octane fuel. Highly recommend the tune.
Did you find this helpful?  8 of 8 Found Helpful
steeda tuning
I'll start by saying i had 2 other tunes where i adjusted certain perameters to get a few more horses,from my car,and i got a little.But after installing your tune,i could'nt beleive the power.The car was all over the road and a little scary when its wet,but its so fun.That tune was perfect in all aspects.thank you.
Did you find this helpful?  12 of 12 Found Helpful
NIce tune
Previously had a Bama tune ,but the Steeda is bit better specialy at shift point and thottle response
Did you find this helpful?  13 of 13 Found Helpful
Very good tune
Have the 91 octang tune on my 2012 gt the tune is spot on from the start shift points are perfect as is the shifting not super firm and the top end is excellent also i feel this is a very safe tune have to worrys about it at all .
Did you find this helpful?  15 of 17 Found Helpful
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