I would think the the SE ventilator should work on the 08 TBW. The only thing that may keep the ventilator from working would be the mounting plate and that would require a redesign of the TBW TB between 08 and 09 which I would think is unlikely. It may be because HD didn't have the SE ventilator until 2009 so their part number ended in 09. HD has a different part number for the SE Ventilator that fits the 08 and later with the 58mm TB. When I looked at my 50mm TB and the 58mm TB ( I have both) they both look the same when it come to the air filter mounting. If you can go to a dealer and see if you can compare the mounting plates between the 08 high flow and the SE Ventilator.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.