Quote:
Originally Posted by ApS
My BIL simply threads a thin-wall pipe from the exhaust port, and extends it about 8-feet straight upwards. No muffler, and the noise simply disappears into the atmosphere. 
This was necessary, as the generator is mounted within an RV, and some discriminating campgrounds can be very fussy about noise.
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What you are describing is a “Gen-Turi” pipe, pretty standard equipment with most serious RV’ers. While it may help a little with noise, it is primarily made to get the exhaust above the roof of your RV so as not to poison your neighbors while in close quarters. Anyone who has ever been to the NASCAR races with their RV’s uses these.
http://www.campingworld.com/shopping...t-system/14041
Dan