Be aware that while you are not changing the headers 748E headers are different from 748S headers (Male & Female bits) if you want to go from 45mm to 50mm
My 748S came with "E" headers that cold not be changed to 50mm without changing the headers, when I bought my "50mm" termis the dealer decided to fit 45mm (instead of telling me that the bike had come from the factory with the wrong headers)
This was only discovered after a period of time at which a discussion took place and new headers and 50mm termi's were supplied
I hope this makes sense, if not please U2U me
PS
If you are going from 45mm - 50mm then make sure you get an unrestricted link pipe.
[Edited on 28-12-2005 by m1keyp]