Strait from Rody Roem (if you don't know he is the designer of all RB concepts engines)
Use the RB2045 with the 92mm header for buggy or long flowing tracks with a truggy.
Use the 98mm for truggy or for tight technical tracks.
Don't see the point of buying a less effective pipe. even if you save some cash.
You only buy one pipe for that mill....maybe a second header if you go to lots of different tracks.
I have the WS7 IIx3 and have the 2045 with the 92mm header on my 777SP2 and I have never felt like the mill lacked anywhere.
Hope that helps,
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