I have a 2001 Kodiak 8.1 that was turned into propane I turned it back to gas there seems to be a code turned off fuel injectors from computer need new computer from when Truck was built before propane was installed ( David Burch, 03/22/2021 )
If you want to send your VIN, we can check to see if we have the proper calibrations on file to do this for you.
Hi. I have a Fleetwood Pace Arrow Workhorse 2004 (vin shows 03 production) with 112,500 miles. I am considering upgrading with your custom tuned engine and transmission module. Would you recommend this? I bought this unit with about 80000 miles on it and have always wished it had little more power. It has bank’s system installed by previous original owner. Also like idea of overdrive under 50. Any input would be appreciated. Thanks ( Clarence Snapper, 01/23/2021 )
For what you are describing, it sounds like you would be quite happy with the upgrade. As long as the engine and transmission are in good health, the added power will not cause any reliability issues. We have tuned many 8.1L's with more miles than you do with no problems.
Sorry to bother, just want to ensure this is the right product for a 2001 GMC Savana 3500 8.1 W/4L80E, currently stock, and whether I will be required to perform the passkey relearn and crankshaft position procedures, and if so, would you be so kind as to recommend the tool(s) needed to do so. Thank you! ( Marc Carignan, 01/16/2021 )
Yes, we can tune the 8.1L/4L80E combination in your GMC Savanna. You would be required to do the passkey relearn but that is a simple process that does not require any tools. The crankshaft relearn procedure would require a scan tool, but most automotive scan tools will have the ability to do this quickly.
Bought my coach used. How can I tell if it already had an Ultrapower update ? ( DON SIMMONDS, 01/08/2021 )
Hello Don, Unless your coach was tuned at our Shop in WA state the ECM would have a UltraPower decal on it . 
2004 Itasca Sunova 27C P32 chassis 4L85E gm transmission 8.1L Vortec. What will your ECM do to enhance performance of my rv. ( Tim, 12/10/2020 )
The engine horsepower and torque will be increased which will allow the RV to accelerate quicker and without as much struggle. It will also be able to maintain speeds and gears in situations where you would normally lose speed and downshift.