I purchased a SM-AFR from PLX devices in January 2023, I didn't install it until April, It didn't work out of the box, I went back and forth with the "tech" he was convinced it was the O2 sensor, he wouldn't cover it, so I bought another sensor, he gave me free shipping and 10% off. that took another 10 days. I finally sent it in for warranty, shipping was at my expense. it arrived in California may 18th 2023, it's now July 27th 2023 and I still have not received it back. the "tech" says they are busy and are having supply issues even though I see the have some for sale. I asked speak with his manager and he told me he was the manager. I thought I would share my experiences with you.