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DS; You're right. the 1D is physically larger, but all the holes and mounts are the same so you can swap one for the other. I have a 1D and love it. Without any modifications I get 8.4 mpg. I like quiet, um, er, well as quiet as I can get that is. The 1D does not whistle, but it has plenty...

LD; You are correct. Not only is there a difference in sound, there's a difference in size as well. The impellers inside the 1C are smaller and travel far beyond the speed of sound and in effect rip the air causing the "whistle". The 1D is larger and does not have the same effect. P.S.-...