Originally Posted by Code
Perrin mufflers fit oem midpipe.
Also look at various JDM options for the BL (or BP, if you've got a wagon or don't mind shortening the tips for a sedan conversion). Many of these are axle-back options.
Back in the day, these included the Blitz Nur Spec and Nur Spec Touring canisters as well as the STi Genome canisters, just as two very quick examples.