I just got my Two Brothers carbon slip-on installed this morning on my '04 ST and got the mapping tuned...after much trial and error. (Tuneboys are great, but there's a learning curve!

)
I love the sound. At idle, it's just as quiet as my stock pipe but the tone is deeper. Around town and on the highway at low revs (3k - 4.5k), I can' t hear it when I'm riding. But once the tach goes above 5k, it sounds great...very deep and throaty without being obnoxious. I'm glad I went with this option since I hate loud pipes.
Staintunes sound great, too. But I caught the TB pipe on sale for less than half the price of a Staintune.
[ This message was edited by: DFWBiker on 2006-04-28 11:28 ]