Well I've never understood the 'More torque threads' that you read about 1100s it's a big twin how much do you need for me it's been about a linear power curve from top to bottom with a few extra HP.
It's all about getting air in and out with a good mixture hence the big Induct with a SJ and PC it's not about HP per se it's about getting what you have as fast as possible.
As far as pipes are concerned why take off very heavy stock pipe and put a heavy aftermarket on?? get as much weight off as you can so that'll be a Ztechnic although were you would get one now??
As for Gus's brakes my AP's worked great but just like any non fully floating disc it used to eat them and they were custom made the PFM's are now on mine.
As for weight saving I'm amazed how little is said on here about Lithium batteries I've run one on another bike for over a year and at some time will put one on the S but as I said in another post 10 years ago my S was at the top of the food chain with Ti this and that were as now gets a little neglected but still gets the job done when asked.