Just by that image alone tells me there should only be a 90mm on the driver's side. That belt looks to be way to close with the 100mm.
Seems 2 90's and a 100 are the way to go.
The smallest upper I'll be running with the Whipple is a 3.20" with a 3.375" pulling duty for DD. This opens up some clearance for the 100mm on the driver side. Sorry I didn't clarify earlier. After thinking it over I'll probably run the OEM idlers for a while... belt slip with the Whipple isn't a common problem to begin with (especially with the larger S/C pulleys) and the MP bracket alone should quell any belt slip in the event it were to occur.
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