Originally Posted by Big Jeff BBQ

I've seen this done at wintrnats!

get every thing ready to break in start the motor and get things running
pipe and all !

Then place a two liter plastic coke bottle up to the pipe mark for a hole for the pipe to insert into the coke bottle and remove the lid to the coke bottle and this quiet's it down greatly !
later
Jeff E

I guess it works like a ext to the pipe!