I had one installed on my 2012 RT at SpyderFest. I previously had a TBR exhaust on a 2010 RT.
The Spyder Attitude pipe is definitely louder than the TBR and has a sharper, cleaner sound than the TBR. It is just one step away from a straight pipe! Since SF they have offered another version with a longer muffler which may be just a little quieter.
Better make sure you like loud pipes before you get one of these. I sure find myself trying to keep it quiet around town and anytime I see any LEOs but other than that I love it !