ORIGINAL: BTerry

Matt,
RC Showcase used to sell carb intake filters that bolted directly onto the Walbro carb. Something like that would work here to eliminate both the intake noise and the flapper noise.

I just found it at Troybuilt. here is the link: http://www.troybuiltmodels.com/items/ZDZCPA057.html
And at Aircraft International (scroll down): http://www.aircraftinternational.com...s/MIntake.aspx

The foam should muffle the sound a bit.

Another option if you don't want to go with these, as they are a bit expensive, would be to get a cheap intake trumpet, wrap a piece of filter foam over the end, and hold it on with an O-ring. This intake will work if you want to try that, and it is very inexpensive. I don't remember which carb is on the SAP-180, but if it is a WA or WT weries carb this intake will fit:

http://www.horizonhobby.com/Products...ickAccessories