I haven't priced them on TD's site, but it's all there. And yeah, you'd lose a few HP on Max 17, but also run richer and fuel quality won't be quite so sensitive - The SMM is so darn quiet it's very different when you have that much HP and can hear the wind and the engine over any exhaust. I'll be running the SMM a lot more next season and maybe just save the 3" Sandale for when I really want the extra HP. It's tough for me too, but the SMM just makes the ride more enjoyable when you're not looking for every last ounce of HP.