I just did a new Camaro, nice black with red stripe, we installed 2 chambered power sticks, we reused the chrome tips and left the short resonators in it. Sounded good! About the best a 6 cylinder can sound i think!  Check out the links:

http://www.youtube.com/watch?v=2mMEMRjPlUY

http://www.youtube.com/watch?v=-4YuQXmxHr8