I just placed the order for a dynojet pv-3 for my bike last night. I put the Tab Performance mufflers on the bike a couple days after I bought it and then decided to do the headers, a 2-1-2 from TP as well. Took it out yesterday and thought it sounded better and performance wise the bike felt the same. Didn't feel any loss of power or torque although I have to preference this by saying I didn't ride very far, maybe 7 or 8 miles total. I've heard that the M8s came pretty tuned already and that you didn't have to add a tuner to the 17s-2020 models but that the 2021 models were back to running lean from the factory again. We will see. I'll let yall know how it turns out. I might get a dyno run before I put the tuner on it and then get one after. And before anyone asks nope I didn't get a stock dyno. Maybe I should have but I didn't.