Cobra swept sound changed

[yahraider]

I have had the cobras for three years . So when I when I was accelerating sounded like baffle was rattling. Next time riding the noise went away and now the sound has changed, almost like I have removed a baffle. So I did take both baffles out and they are in good shape. Anyone have any idea why the exhaust sound would change........
i emailed cobra and they told me the sound should not change at all........

[yahraider]

Okay worse possible news it was exhaust valve. Have to replace top end of motor with only 11000 miles"....................

[Michael T]

How could you knock out a valve in that many miles. Unless they were out of adjustment.Then might be possible.

[Dave Polucha]

I have 24000 on my 08 Raider and I had the valves checked at 18000 (the manual says 16000). The mechanic said they were spot on, just like they came from the factory. Sorry to hear about your valve issue (I also have the Cobra Swept exhaust, Big Air and Power Commander 3).

How could you knock out a valve in that many miles. Unless they were out of adjustment.Then might be possible.