Also known as the DIY Pedro Sport Exhaust (PSE):
Make the Pedro Sport Exhaust
Been contemplating this since I'll be doing the second cat delete soon anyway.
Way too complicated to start hacking into a standard Boxster muffler. Won't improve the resonance (=exhaust sucking) characteristics of the exhaust either. The PSE just pipes a small fraction of direct noise to the outside world.
Yep, any information on exhaust valves would be appreciated.