At the risk of trying to teach granny how to suck eggs....for the less techy do some basic home work of why and how the TUV do their emissions test, and save them that it’s at 4250 revs, now...the way to stop emissions is to stop fuel going in....
Hence why a combo of decent headers, no poxy cat, no lamba(O2’s) and a decent fuel map so the engine is running the way it was designed too and a full fat mid range fuelling all of a sudden you have a whole new bike on your hands, of course it requires money and effort to get off ones backside and get it done (currently doing the same on a KTMGT) what a ball that is compared to the X/R but their ain’t no 2021 X/R going to outrun my 17 model I can tell you.
