Just use a straight pipe any muffler shop can make or get one for you then have it welded on in place of the resonator. I finally did it on mine and it made a big difference compared to with it on. It also got a little louder after a month or so. Sounds good now the way it should have to begin with. I cant believe Borla doesn't make a pipe to replace the resonator. Such a simple thing and makes the S-Type muffler sound as it should. Also, I did not loose any back pressure of low in torque. Performs and sounds great.