Well Ray,
So you think i started to early with the Ecklers partying hugh?
In anser to your question i have the corsa exhaust first started with stock to corsa and it was very quiet though you could hear the difference at throttle.
next i changed from the touring to the more aggressive system with an x pipe an no resonators and it sounded like a european ferrerie good. so i was still not quite there an added SLP long tube headers high flow cats x pipe and Corsa exhaust and that did the job also there was no DRONE. now this was on my 06-C6 vert pics posted. induction has K&N filters and they flow like mad infact when i added the blower Next Level said not to bother changing the inlet so i didn't. hope this helps Mike.