Where are you quoting your figures from?
I know of a DC5R with K&N SRI, BuddyClub 3 Exhaust and Hondata K-Pro pulloing consistent 138fwkw @8500rpm here in qld as well as a couple of DC5R's pulling around the 120kw mark with CAI or SRI and 2.25" exhaust and hondata manifold gasket.
And a 60mm exhaust i belive would be too big, BC3 isn't even 60mm or 2.5inch. Both CAI and SRI have the pro's and cons but powerwise there isn't a massive difference.
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