Well I think the Gibson is finally taking a crap on me. I keep hearing this rattling sound coming from the muffler when I'm accelerating at certain RPM's. So I think it's time to replace it after about 4-5 years of hard life. What do yall think??? Give me some good feedback on some mufflers or cat-backs that sound good but not too harsh and don't have that drone at 60-70 mph. That was one thing about the Gibson it was pretty quiet down the hi-way and not too harsh at idle or slight accel. Hell' now that I think about it I couldn't even hear it at the track when watching the video playback!!! Flowmaster is defenetly (sp.) out of the question. I was thinking about magnaflow or dynomax but wanted some opinions on these or any other I should consider...Zed