Hayame is another one of those trinkety brands like OBX. It's the same canister muffler "formula" marketed under a different name. They're distributed in the USA by SPW Industries and aren't anything to write home about.

If you're looking for a civil, cultured exhaust note... look at the Apex'i World Sport II.

If you want a flatulent, boomy and horrendously loud exhaust note -- one that will have your neighbors pelting you with various sorts of rotten produce -- remove your stock exhaust altogether. Just save the $250 for your first noise violation ticket.