Lars,
I run en E-Cutout just behind the cat. When I want to run basically straight exhaust I just hit a switch on my dash and open the electric cutout. I then get a loud, deep sounding exhaust that sounds more like a V8 than a four cylinder. When I want to quite things down I just hit the switch in the oposite direction. It works great. Here's the URL of the company that sells them.
http://dmhperfproducts.homestead.com/borlaplate.html