I installed the Banks headers with the H crossover this summer and fell like that was a big improvement. Not sure if I saw any gas MPG improvement but nice performance improvement, a few hills that before it would downshift I stay in overdrive. Would I see even more of a performance improvement with the ECM and TCM that it makes it worth the money?

2004 Winnebago Adventurer 8.1 65,000 miles ( James Turner III, 09/05/2022 )

Yes, the programming works very well whether the vehicle is completely stock or has modifications like yours. The Banks headers and programming are the two upgrades that make the most difference in performance on that vehicle.

It is a 2002 avalanche 2500 not sure if it’s 4l80 or 85 but I just bought it and it has no cats and also just has 2 02 sensors is that something you can work with and what kind of gains would I be looking at if so? ( Robbie , 09/03/2022 )

This should have the 4L85E, which is just a slightly updated version of the 4L80E. We can definitely work with what you have and would expect gains of around 50-60 horsepower and 70-80 lb. ft torque.

On the E.C.M. Does it come pre programed to this unit? Mine is Bad can't get the cam shaft sensor light to go off. And is this the total priced? Thank you!! 2001 Damon Challenger 8.1 vortex ( michael brewer, 09/02/2022 )

These do come programmed to the vehicle, plug and play. Since you have a bad ECM, it would not qualify for the core exchange as only good ECM's are accepted. That would make your total price $745 before any taxes or shipping.

Is the core charge sent back once the core is returned to you? ( Kevin Parker, 08/31/2022 )

That is correct!

Do you bave the capbility to tune an 8.1 engine that has afternarket parts already added (such as the stage 1 package offered by Raylar engineering; heads, camshaft)? ( Coleman, 07/31/2022 )

Yes we do.