Yeah, based on limited experience with the R4-S (all the autocrosses this year, before last weekend) it's about the same as the HPS. But either pad is likely to be toast after a track day or two. It would be worth it to have a fresh set for the track that may or may not get 2 or 3 days use and save the R4-$ for Solo.
__________________
FWD is the new AWD
|