I got the Sto-n-Sho. The hidden bracket is mounted, the part that clips in with my plate is in my trunk. I put it on if I don't want to get harassed that day for whatever reason. Usually it's in my trunk. If I get pulled over I'll act like I thought it was on, and that I must have left it off...
I HATED THE SOUND. Sounded like a ricer to me. I have mine up for sale in the marketplace. just got a borla touring catback and I'm 100% happy now! I actually prefer stock over the Roush exhaust, but the borla is FINE :)