The R motors only come with the sportmaster lower which is useless for 99% of pros boats. A lot of regular folks that bought the R motors have had to buy a torquemaster lower to get their boat to run right since the sportmaster is designed to run above pad. If you have an Allison, Bullet, Ballistic or Stroker then the R is a fine choice but for all other boats it’s the wrong choice. The only difference in the XS and the R is a solid lower motor mount, other than that they are the same.