Feather duster value

YY1 said

Is this the red one with the space duster fold down seat listed for 2K?

http://collectorcarmarket.com/menus/ccmprcs/76plduer.html

Click to expand...

So a feather duster adds 15% to the value:for every 1,000 it adds 150 bucks.It doesn't say what the 4 speed would be over that stock duster