Yeah, for a time SMT produced some heads for Piranha. If you google Piranha Golf SMT the hybrid from that “union” pops up in images.
From what I’ve been told the Mellow Yellow did get national attention, mostly due to the name and the look. The Ball Breaker, based on the NB and hotter than standard takes it to a next level! It might be yellow, but it ain’t mellow 😄