I have been noticing a lot of enquiries about what is the best slipon but I think that's because most people don't want or need the performance improvement of a full system. HOwever, I doubt the OEM exhaust was designed to add strength to the frame of the 14r. Far as I know, the 14r frame is very similar to the Gen1 14 where the frame joins up to the airbox to arch OVER the motor. There is no frame necessary underneath.
Looking at your avatar, I see the 14r header is very different from the Gen 1 but still, it's just a clamp that holds the midpipes in the collector and those have gaskets that would leak if there was a lot of stress being put on them by supporting the weight of the bike and rider. So I'm going to guess, NO, the exhaust has zip to do with holding the bike together. There are full systems out there on the market and as I'm sure you know, they are a lot lighter than the stock exhaust. I'd say go ahead and install your full system or bend your pipes and bold 'em on if that's what you had in mind.
notice massive headpipe for frame rigity
I take it that is your assement? ...or do they actually say that on the Kawi site?
08 MIDNIGHT SAPPHIRE BLUE ZX-14 Now Deceased, will be resurected
2024 ZX-14R bran friggin NEW!