My purpose, as usual, will be mostly "looks" just another thing to look at and wonder WTF it is telling me.
I think the usefulness in the head temp for a street bike is in the compiled "data" of watching them and then when something unusual happens with a temp you know you need to investigate.
I have read that most serious racers use both head temp and EGT, and the combined data can tell them a lot about how or why things are happening, racing is a whole different game on a different level.
I have a hard time hearing detonation, I think its learned trait, and my hearing is way bad now, had to get hearing aids last year so now it will be worse.
The 2 modified bikes I have are super fun and I would not go back, and I will end up with new mods on both if I keep living and liking them, they would both be better suited to average street riding I do if they were stock.
I especially like my H2 because its so easy to work on, super fun power band !!, handles averagely well, and always seems to need attention which fills my need to fix stuff.