sorry...50mm termi half system. if you haven't done anything to your 748r you know what a pos it is below 6k rpms, how it barely idles, has a huge hole in power delivery between 4-6k rpms, and then feels like an i4 power rush at 7k.
this chip will virtually eliminate all the symptoms associated with the 748r bikes. with this chip my bike was as streetable as ANY other superbike.