The muffler in the Imagine Auto link looks more like a Dansk than a B&B triflow. I have the Dansk and I like it. Very little resonance, great sound. Here is a link to another ECU tuner.
http://www.ortonperformance.com/ I'm considering these upgrades as well, yet when I consider all I want to do and include a glass windowed top, I quickly come to the conclusion looking for a 03 or newer S in the dead of winter many be the right call Vs Mods.