Just a quick note on the extra cost. If the specs for the B2650 and B3350 are accurate, and if you use the Kubota Engine cross reference, the B3350 is a turbocharged engine, with DPF muffler. I went to the dealer to look at the B2650, when I opened the hood I could not believe all the free space that they had under there. Now if you take into consideration that the B3350 is the same size (plus a hood scoop) has a turbo AND a Diesel Particulate Filter (DPF) Muffler, that is a lot of junk to cram under the hood. It would explain the extra room under the hood of the B2650
B2650 specs: Products: B2650 Kubota Canada Ltd.
B3350 specs: Products: B3350 Kubota Canada Ltd.
Kubota engine ref: Kubota Engine America - Compact Diesel Engines
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If you like simplicity and have DIY blood, B2650 might be the ticket.
Good luck with your shopping.
I am not sure which part of their specs are wrong. The engine designation indicates a turbo but they call the aspiration 'natural'.