If the boxer motor were outdated, Porsche & Subaru wouldn't continue to update & race them. Successfully I might add. Nor would Der Moterrad.
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Danny

'07 R12GSA (Moose)
'04 Sherco 2.9 (Sherpa)
'97 KTM 400 R/XCe
'90 RMX 250 (woods weapon)
'08 Black Lab (Auto)
IBA #30344