I have also, just installed the TopSpeed axle back and will upload the video of cold start and a few revs from it as soon as it uploads. its much Louder, and Drones a bit. So you will be able to hear the difference in the of the two Axle backs.
I prefer the tone of the Garageline Axle back to be honest. But I now have both and can with in less than 30 minutes whenever I want. I'm glad the Garageline exhaust has stock(ish) routing, it makes it much more versatile
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