stern12,
Brent sold me some "Staintune Slashcuts." Their workmanship is second to none (really!). They have removable sound restrictors that give you an "either/or" scenario. But, they will set you back seven Benjamin Franklins (ouch!).
But I love them. I replaced my "Bub Megaphones" with them (which are quite sought after).
Staintune is a Australian Company (they could have a criminal geneology

). The TBA pipes they make can be read about
at this website. -BT