My 02 sprint st has 30,202 joyous miles on the clock, and suddenly i noticed there was a tick in the top end! grr. I pulled my stubby exhaust off and put the stock on for a better listen, and heres what it sounds like... it seems to come and go, and doesn't seem to have a pattern of what makes it do so. what are your thoughts, concerns, ideas? Thanks! http://youtu.be/6PlQaDqL0F8 p.s might I add, i checked the valves at 28k.