Good Morning,

I am putting an XB12 Top end on my S1W and using my S1W Thunderstorm heads on my Old M2.

My question is about my Inlet situation on the XB12 heads, can I use Sporster EFI Inlet flanges and then my normal inlet manifold for my 42mm Mikuni, its a 2010 XB motor.

Many thanks in advance.

No, the bolt spacing changed in 2007. You will need the later flanges 27327-07

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08 Specialized Langster

OP, presumably a 97/98 M2 then. Bear in mind you need to transplant the Thunderstorm pistons along with the heads into the M2.

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Try doing this to yer fueller...........