Hmm, actually I changed my kickstand before
the SBP expansion chamber - I'm not 100% sure but I think my old stock kickstand would still fit... mebbe
I changed the kickstand to a rear mounted one because I tend to have a LOT in my packs, I commute to work and go on "long" trips so they're usually packed with all sortsa crap - not least of which is the netbook laptop I use for tunes etc. at work (the value of that modded lappy exceeds my bike lol).
The stock kickstand on a new Schwinn is a total POS, even unloaded I could stand there and watch it bend. A heavy duty kickstand mounted near the center of weight is defo the way to go. I'll be getting a centerstand at some point if I can figure out how to make it fit
BTW - insofar as SBP exhaust system mounting techniques, apparently mine can withstand a roughly 30mph cartwheel - not bad for about $5;