The first time I start the car in the morning a second or two after start I get a rattle that lasts a couple seconds and it's gone. No rattle the rest of the day. So this morning was 37 degrees F. and I had the wolf start up the car as I was watching the belt tensioners to see if they were marching to the beat of the rattle. Nothing as they were smooth as silk. However the rattle seems to be from the supercharger as I can feel it on top of the motor. It was repeatable. Only lasts a couple seconds and it is gone. Let the car sit for a half hour or so and it is quite as a church mouse. Only ran the car 10 seconds or so twice. Car has 26,000 miles. Your thoughts are greatly appreciated.