Unfortunately, I could not find specs on the stock tailpipe diameter on the 2022 6.6L Duramax trucks. This tip has a 5" inlet and will only fit 5" diameter exhausts. Your best bet would be to measure the diameter of your truck's factory tailpipe. I have a feeling it's probably in the neighborhood of 3.5", but I'm not entirely sure. If you need a different tip based on your measurements, give us a call directly at 623-434-5277 or email us at [email protected]