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1997-2021 5.4L, 6.7L & 6.8L RV/Motorhome with Preloaded 5 Star Custom Tunes (MotorHome Magazine Reader’s Choice Award Winner!) 7015FS

4.69 out of 5 based on 29 customer ratings
(29 customer reviews )



MotorHome Magazine 2012, 2013, 2014, 2015, 2016, 2017 & 2018 Reader’s Choice Award Winner!

This product is not legal for sale or use in California on pollution controlled motor vehicles. Thus, this product will not ship to addresses in California due to state regulations.

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    This is applicable for 2016+ 6.8L and 2020+ 7.3L applications only.
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SKU: 5ST7015FS(1997-2019 5.4L, 6.7L & 6.8L RV) Categories: , , , , , ,

Why Tune My Vehicle? From the factory, your vehicle’s computer is calibrated for the masses, designed with the average driver in mind, not the performance enthusiast. This not only leaves valuable horsepower & torque hidden inside your vehicle, but it also makes for a mediocre driving experience. Our tuners unlock your vehicle’s hidden performance by re-calibrating your vehicle’s PCM for maximum horsepower & torque, increase throttle response, clean shift points, increased efficiency and the best driving experience possible.

More Performance & Less Downshifting! 5 Star Tuning’s Custom Dyno Proven UP to 42 HP & 75 TQ tune files on our 3V 6.8L Tiffin optimize the vehicle’s Air/Fuel Ratio, Engine Timing & Fuel Curves for Maximum Performance, Improved Shifting without the High Revving headaches all while maintaining OEM reliability.

Why 5 Star Tuning? We are your industry leader in Ford and GM truck, car, suv and motorhome tuning. We create and offer the most refined tunes on the market for your application. Rather than offering you a one-sized fits all approach we custom tailor all of your tunes to your specific needs. These needs can be more power, more torque, tuning for your current or future modifications or simply getting the best driving experience from your vehicle. In addition to our refined approach to tuning vehicle, we ensure your vehicle’s reliability will never be compromised.

Accolades: MotorHome Magazine 2012, 2013, 2014, 2015, 2016 & 2017 Reader’s Choice Award Winner!

Dyno & Street Proven Tunes! Our 5 Star Tuning custom tunes have been dyno developed, refined, tested repeatedly, street tested, tow tested and driven all over the country in our own personal vehicles. Nothing says highest quality tune on the market such as investing in our own vehicles and testing them for over a million test miles by our own engineers.

Free Tunes for Life! Have you added a new mod to your motorhome and wish to maximize your application’s performance? For all of our Tunes for Life members these modifications are free for the life of your vehicle while you own it. This will ensure that your vehicle run properly with our dyno and street tested tunes give you the most horsepower, torque and most efficient performance possible with your newest addition. For more information on what qualifies for free tune upgrades visit

Want More Performance? A 5 Star Tuning Custom will dramatically improve your drivablity, horsepower, torque, throttle response, efficiency, and towing capacity. Eliminate your factory speed limiter, sluggish throttle, sloppy shifts and lackadaisical nature of your vehicle.

How Do We Get More Performance? Our tunes bring the most potential out of your vehicle by adjusting your fuel tables, drive by wire, timing, torque converter, shift strategies and shift pressures. Visit our Custom Tuning Info section for more detailed information for your specific vehicle.

Which Tunes Are Available For My Application? No matter if your coach is stock or heavily modified, our 87 RV Daily Tow tune is the perfect match for your application.

How Does The Process Work? Below is a step-by-step overview of our custom tuning process.

  1. Plug your device into the vehicles OBDII port. The device will automatically power on.
    1. If the device does not automatically power on, you likely have a blown fuse that needs replacing. It will be the same fuse as the cigarette lighter and 12v accessory port. 
  2. Select “Program Vehicle” by selecting the center button on your X4 and follow the onscreen device prompts for key cycles on and off.
    1. The first time tuning your vehicle will take some time. The device will save your stock file in addition to tuning your application.
  3. Under preloaded tunes, select 5 Star 87 RV to load onto your motorhome.
    1. If the device states “unsupported vehicle” use the steps outlined below to obtain your ecu strategy code and/or ecu swpn. 
  4. After you select your tune, you will have user adjustable options. Continue with this step or arrow to the right and select approve to skip. After this step, custom programming will begin.
  5. Once tuning has completed the device will show download complete and will prompt you to turn the key off. At this point, you may disconnect your device.
  1. If in step 3.1 you received an “unsupported vehicle” message we will need your ecu strategy code or ecu swpn prior to writing your custom tune.
  2. Email your vehicles ecu strategy code to Below is the needed vehicle information: 
    1. For 1996 – 2014 vehicles: calibration codes are listed under “ECU Strategy”
    2. For 2015-2021 vehicles: calibration codes are listed under “ECU Strategy SWPN”
    3. For 2011 – 2016 6.7L Diesel applications: calibration codes are listed under “ECU Strategy,” “ECU SWPN,” “TCU Strategy,” & “TCU SWPN.” 
    4. For 2017 – 2019 6.7L Diesel applications: calibration codes are listed under “ECU SWPN” & “TCU SWPN.”

How Long Does Installation Take? The installation will take approximately 5-10 minutes.

Do I Need A Shop To Install? The installation process of the tuner is simple and can be performed by anyone. No tools are required for the installation.

What If I Have Other Technical Questions? We can always be reached at 843-536-1244 or via email at for questions on concerns on the tuning process. We also feature a support page with information and videos pertaining to loading your custom tunes, updating your device, installation, etc at

Note: SCT’s software is only compatible with Microsoft’s Windows operating systems.

Notice: By ordering this tuner, tune or performance modification you agree to assume all responsibility for assuring that it is in compliance with all U.S., Canadian, international, state & provincial laws and regulations. 5 Star Tuning 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 our products or services.

How Much Quicker and More Efficient Can Your RV Be?

See The 5 Star Tune In Action

Motorhome Magazine’s “5 Star Tuning Talk”

5 Star Tuning 1
5 Star Tuning 25 Star Tuning 35 Star Tuning 4


Weight2 lbs
Dimensions7 × 7 × 4 in

Bully Dog, SCT, SCT/Bully Dog

29 reviews for 1997-2021 5.4L, 6.7L & 6.8L RV/Motorhome with Preloaded 5 Star Custom Tunes (MotorHome Magazine Reader’s Choice Award Winner!) 7015FS

4.69 out of 5 stars

  1. 5 out of 5

    Michael L FLeury

    I had an issue with my Nguage tuner that caused me a lot of trouble. Tony was awsome in getting me a replacement tuner RTD. Again I had issue with getting tunes and tuner to work together. Again Tony worked with me with a stubborn tuner and my finicky truck. Through many emails and phone calls, we finally got the problem resolved. My hat's off to Tony and Adam for working through this with me. Bad ass job guys!!!

  2. 1 out of 5

    Waylon Brown

    Pre 5 star tune we were considering going to a diesel pusher from our 2011 Itasca Sunstar. We loved the RV but the lack of power and constant down shifting was very annoying. Post 5 star tune and we have no plans on selling the Sunstar and going to a DP. The difference is amazing. There is noticeably more power and the V10 moves the RV without straining now. The interior noise is a fraction of what it was. Now even moderately steep hills are taken without downshifting. This is a rare exception of getting more than you pay for.

  3. 5 out of 5

    Ron Warren

    Fantastic product! Unleashed the beast in my motor home. So much better power uphills and downshifting. Worth every penny!

  4. 5 out of 5

    Jason Sheffield

    I have a 2017 Thor ACE 30.2, without the tune it would struggle uphill, the shift points were off. With the tune I can climb through the sierras no problem and could pass the semis that were in my way crawling. I check gas mileage on my last trip (mostly flat) and I increased to 8.1 mpg running the generator the whole trip for kids. Before gas mileage was a low 6. Great upgrade for any RV, you won't be disappointed,

  5. 5 out of 5

    James M. McDowell

    After purchasing a 2019 Coachmen Leprechaun I came across this device on a Facebook push. Looked it over, watched the videos but was a little set off by the price. During a trip to North Carolina a fellow camper came over and basically told me "i was put off by the cost as well, but pulled the trigger and made the purchase. Man I'm glad I did". That was enough for me to purchase it. Company stayed on line with me well past closing to get the tune downloaded and onto the device. Vehicle loading was simple and took 15 minutes. First trip was from VA Beach to Lancaster PA with a toad. First tank of gas had some old tune miles and some generator time on it. First fuel stop showed an improvement of 7.1 to 7.3 MPG with a toad. Second and third tanks were 7.8 with a toad. The additional MPG is an added bonus. Tune provided much better acceleration, better shift points, less uphill downshifting, better standing start power, quieter in the driver area, you name it, it was better. It was an effort not to drive this thing like my Tundra.

    If in doubt, don't be.

  6. 5 out of 5


    OMG ... the feeling of driving up a small hill in 6th gear maintaining 70 mph ... sweet.

    We run 25000 pounds and are used to hanging with the slow trucks. Trying to pass was just too much drama. I mostly had to hand fly the rig as cruise control would make the drivetrain downshift to 4th way too easy. I just gave up and drove it at 60 mph.

    Post update the rig loves small inclines now. It's like having a 75 lbs electric booster now. I hang with the average speed trucks now. My wife immediately remarked how quiet it was. At one point I looked over at her and said l just hit 80 mph and she did not even notice!

    This was one of the best upgrades after you get a tpms, navi, and camera setup.

    Post update

  7. 5 out of 5

    TJ Chambers

    Had an issue with an email tune. The guys at 5 star sent me a tuner next day air since I was taking a trip and needed the tune. Cannot wait to see how much improvement the tune makes. Very Happy Customer.

  8. 5 out of 5

    Daniel Roper

    After reading the reviews I had to join in to express my satisfaction with the the 5 Star Tune on My 2015 Winebago Sightseer 35G. No big trips yet but just a short 50 mile trip around this area I noticed a major change in the performance of the V10 powered drive train. The difference was so obvious I can’t wait to hit the road and go somewhere. Living just north of Dallas we head up to Oklahoma now and then and the little hills make me disengage the cruse to keep the shifting under control. The little hills I tested in the 50 mile trip had no shifting and held the speed constant. Very nice. Thanks to 5startune for developing this product. It is well worth the price.

  9. 5 out of 5

    Kin Richardson

    To be honest, I didn't want to spend the money, but I'm glad I did. I live in West Virginia (the mountain state), and the factory shifting of my 2008 E450 Ford chassis Class C was a mess. Upon losing speed on a hill it would downshift WAY down, skipping gears, revving the engine over 4500 RPM at times. The engine would suddenly sound like it was going to explode. It was very unsettling, which didn't make for relaxed driving, and I couldn't help worry about the engine and transmission. This was what caused me to spring for the tuner. I'm so glad I did. First, it added noticeable horsepower and torque. What this did was enable the RV to hold speeds on grades that it simply couldn't do before. In many cases I can now hold 60 MPH (which is where I like to cruise in an RV), on fairly significant grades, without downshifting. All by itself, this is big. On steeper grades, when downshifting is inevitable, it's measured and logical. It holds the higher gears as long as makes sense, then begins to drop thru the gears. No sudden jumps from 2500 RPM to 4500 RPM. Upshifting is also improved. Before I never used cruise control, because I was always trying to protect the engine from ridiculous downshifting, and the resultant over-revving (in my opinion). Since the tune, I'm able to lock in the cruise control, while traveling in West Virginia and relax. I'm sure I'm saving wear and tear on both the engine and transmission. As best as I can tell, there is no change whatsoever in my gas mileage, but that's with a definite power boost, so I'll call that a win. So glad I acquired this tune!

  10. 5 out of 5

    Ronald Neal

    Took my first trip after installing the 5 star tune on my Thor Class A motorhome with the infamous 6.8 V-10. Let me tell you, this is awesome. my motorhome now shifts like a dream (It was horrible before.) Also I can now use my cruise control. I tried using cruise control when i first bought the coach and immediately knew it wasn't going to work. the least little hill, it down shifted too low and the engine was screaming. now it's perfect. Well worth what i paid. Thanks so much.

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