closing

Sorry if this has been asked, I could not find it. My engine noise is louder than in previous years. This only occurs at idle. With an increase in rpms there is little noise. Could it be that the exhaust riser arm is becoming clogged where the water comes in but with increased rpms more water...

Just received a new thermostat from John and discovered that he will be closing his parts business: http://www.feathermanenterprises.com/index.html Too bad. He has been very helpful.