I have read thousands of posts on the HD forum tech site, most users like them and a number of Purists hate them,You can talk to the developer any time by phone, I used them on my 07 SEUC, they make a noticeable difference in drivability, smoother running at low speeds a little quicker accelleration, and slightly lower operating temperatures. they certainly dont work for everybody, they function during closed loop from Idle to 4,000 rpms I don't get above that very often, and the MoCo has open loop set rich enough that nothing is going to burn up anyway, the trouble codes apparently were on the 08s and occurred during the starting cycle, from what ive been told the problem does not exist on the new units. Install takes approx 15 minutes if you take your time, you disconnect the 02 sensor plug and install these in between, the
ecm runs closed loop at 14.6 afr but the injectors are inputting 13.8 which is a more user friendly blend. I read a post recently where someone on this forum ordered a set for his 09 CVO so there should be a first hand report soon.