Couple of points:
6.6 gallon is $240 versus $550 for the 10 gallon, (10 gallon also uses internal vacuum-operated fuel pump)
6.6 gallon is easier install also; whereas the 10 gallon IMS tank requires more fitment and minor modifications.
Actual capacity varies with 6.6 gal IMS so you will gain anywhere between 1 to 1.5 gallons over the stock tank (5.5 US gal actual) tank. Not uncommon for IMS 6.6 gallon tank to hold 7.1 or 7.2 gallons of fuel.
If you want the 10 gallon, if time and money is of no concern and possible frustration of a tedious install does not bother you, BUY the 10 gallon.
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