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I just bought this 03 GT Convertable, with the flowmaster cat & x pipe. and apears to be stock mufflers. The sound is great untill it hits about 2 thous RPM and then the very loud drone sound kicks in. On the flowmaster site they say there 3 chamber muffler is moderate? It also says it will help with the interior noise. Anybody try this or have a differant fix. Cant hear anything after 2000 RPM.
Thanks for any help
lol. I had a custom H pipe with a frankinstein system and two sets of hollowed cats and it had a mad drone around 3500. Then I went straight pipes with only one set of hollowed cats and now its so loud I get pulled over.
The dynamax line has good drone elimination on their mufflers. Tho, I don't like the drone.
Flowmaster Cats & X pipe ? 
Drone 
