I have a set of Motorcycle Larry "Driver foot peg extensions" which lower the rider's foot peg by an inch or so. It does make for more comfortable touring for those long in the leg. If you are inclined to lean the corners enthusiastically you will tend to scrape the pegs. They are spring loaded so no unpleasant surprises.
I also have a pair of mufflers which have been worked on by Redline Exhaust (
https://redline-exhausts.com.au/). They give the ST a nice note without being obnoxious in any way. Whilst the motor might breath a little better I didn't notice any performance changes. There may have been a slight improvement in fuel economy, but it might also have been my imagination. If interested, PM me as I won't bother to bring them over if no one is interested.
Cheers ... Mark