I believe an HP2S airbox would fit an R12S and would provide more cross sectional diameter, keeping in mind that intake diameter and velocity are inversely correlated all other things being equal. i.e if you put an HP2S airbox on a stock R12S it is likely your air velocity could decrease and potentially could result in a loss of power unless other measures were taken. I have inquired about the BB for my HP2S and Rika thinks that I will need to increase my oil flow if I go for any additional HP gains. I guess that is the next project! 
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2017 R1200GSW Rallye Shreddr Signature Model
Last edited by shreddr; 02-03-2014 at 04:48 AM..
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