just noticed something on mazda's website
 

i was fooling around with there mazda maker for the P5, and they seem to offer a sport exost(sp) package now for the P5.....expensive though its about $400cdn

Yeah. That exhaust has been available for I think a couple of months now. Check around the forums, it's been discussed on here.

Dealer installed option. Yes.

From that form it tosses the configuration to your nearest dealer. There the dealer would install the exhaust.