I have a 2021 ninja 400 and put a hindle slip on on the bike. The bike will get to 5 out of 6 bars on temp and every once in a while the bike will stall out/shut down when I stop in a parking lot and sit for a minute or when I pull into the garage. I took the bike to the dealer and they said that its running to lean and I need to invest into a power commander and that the slip on voids the warranty. The other option he said is put the stock one back on and see if it still does it and if it does then bring it in. I wanted other's thoughts on the situation.