Any progress on this awesome project?
Found a couple of links you likely already know about, but for anyone else interested in these SLC here are a couple of other DIY's - not as good as this one but still cool.
like the sound of the single exhaust when it rpms
Introduction ? Swartz Garage
if you toggle the SLC at the top a whole menu drops down covering every aspect of the build which if not useful may be of interest anyway