Originally Posted by Sindarin
Don't know why they get more noisy over time. I wouldn't worry about it unless it starts setting a fault. If it bothers you that much there is a newer part number available (13907618652 approx $90) due to the older style leaking leading to evap emissions faults. I can't say if the newer part would be any quieter though.
the valve is about $60 from mckenna parts. Do you know how difficult of an install this is? I assume this part lives in the engine bay?
If it is easy to do, even if the noise does not go away, for $60 it is worth a try.
Not that the noise really bothers me.