A lot late to answer but in case anyone else is wondering, here is my experience.
I have a '21 non-ho and was in a pickle a year or so ago and went with Hunterworks. It felt like it was slipping on hard launch more than the detonated original belt it replaced. I didn't run it for more than 500 miles and replaced it with a Mitsuboshi which feels just like factory. I kept the Hunterworks for a spare.
Bob
I have a '21 non-ho and was in a pickle a year or so ago and went with Hunterworks. It felt like it was slipping on hard launch more than the detonated original belt it replaced. I didn't run it for more than 500 miles and replaced it with a Mitsuboshi which feels just like factory. I kept the Hunterworks for a spare.
Bob