I jump her pretty hard in 2nd yesterday and she spun 'em through 2nd and 3rd with the bald 555 RII's. Later, I roll into it hard in 2nd and it sounded like the left exhaust was vibrating against the floor pan but only in 1st and 2nd. I popped the hood and free revved it but could discern much movement. I guess I need to take off the hood and do a run to see how much the motor is actually moving.