That design was originally manufactured or sold by a company called Lavizarri, I had one on my 1100 way back in the day. This was way, way before the W5AM was unlocked so I never experimented with remapping but it was the system that first taught me exactly how useless Fat Duc Lambda sensor foolers were.
My experience with the 1100 with the stock map was that as long as you kept the dB killers installed it both sounded good and ran as well as the stock bike. Remove the killers and it was awful! Not only stupidly loud but also raucous in a sort of 'Tinny' way it also obviously engendered a very harsh lean condition! I didn't leave them out long enough to find if it would cause damage.
In 2008 when I bought my 8V I swapped the pipe over on to it to see how it felt. The answer was awful! With the dB killers in it it felt strangled and with them out the racket was unbearable and there was a h-u-g-e flat spot from about 3,200 through to above 5,000 regardless of throttle opening! It stayed on for a total of about 10km and ended up being refitted to, and sold with, the 1100. The bloke who bought it ran it with only one dB killer n to "Improve the sound'. I shudder to think what this did to the harmonics!
Mine also cracked repeatedly around the 1 into 2 splitter. You knew when it happened as it's proximity to the lambda sensor caused the bike to run like shit as will as making it backfire like crazy and hiss like a farting snake!
Would it be possible to build a decent map for it now? Probably but I really have no idea as, as I said, this all predated the Guzzidiag suite of tools and map manipulating software. My admittedly biased opinion is that in all honesty there are many better options available performance wise but I also admit to liking it a lot aesthetically.
All those years ago![You must be registered and logged in to see this image.]