Ok Ive looked and wanted a direct answer...I bought a GYTR slipon for my 06 R6, and there are mid-pipes out there to buy, but couldnt the local muffler shop cut out the cat, weld on some new pipes in place and keep the headers stock? If so should the honeycomb be busted out? With no PCIII the o2 sensor should stay intact so the ECU will adjust to the new setup correct? I know the ideal thing is to buy race full setup but most of us are looking for cheaper ways if possible. Any light on the subject?