Originally Posted by mclrn227
Just got my GR axle back yesterday with 5" mufflers and quad staggered single-walled tips. I couldn't wait and installed it when I got home from work. AHHHH the bassy drone.
Everything else is perfect. But, anything under 3k rpms sounds like I'm riding in a helicopter filled with 12" subs. I guess it's to be expected in the hatchback though. So, I just ordered some Video Link: http://www.amazon.com/Stinger-RKCP12-RoadKill-Carpet-Pad/dp/B001TH8OC4
to put down under the spare and I think that will really make it perfect. The sound is great. I just need to cut down on the bass.
I have the nameless catback with 5" mufflers on my GR hatch. I've had it for a few months and I do not have anything like you are describing. I had just axleback on for a bit as well. The only time where I get a lot of noise is above 3500 RPM and cold idle. You shoudl check to make sure you tightened it properly to the midpipe.