RE: JAE, S pipe, TX21M Observations and test results from the pond...
I've been seeing good feedback on the pipe. I can't see buying a pile of pipes to find out which one the boat likes, I've been there a few times in the past.. I really didn't want to go with an OPS 3280 as I had one of those before it it was just too loud and would need an insert or muffler to tone it down.. I've also had good luck with Irwin pipes in the past so the Cooper/Irwin appealed to me.
Rod Geraghty called me a few years ago (boy, was I surprised when I looked at my Caller ID!) and he was telling me about he and I want to say if I'm correct, Kentley Porter trying the Irwin .21S pipe on a .12 'rigger and how well it worked for a SAW boat. At that time the 21S pipes were rare.