Friday just putting in, motoring out of no wake zone, finally hit the gas, nothing there no boost, very slow, not in L-MODE. only 6500rpm and about 62mph. Usually 7800rpm - 8000rpm and 80++. i think it may be supercharger clutch but i dont know for sure. nearest dealer 120miles away. Recently did 50hr service and new plugs.
Make sure the hoses aren’t loose, as they can disconnect, especially after a service if they weren’t tightened all the way. After that, may be clutch.