Anyone pull the boss mufflers, and put on the 11/12 GT500s?

[69gcode]

Replaced the stock mufflers a couple of weeks ago with 11/12
GT-500 axle backs. No drone at all. I have the 3/4" restrictor plates on the side exhaust. Very happy with the sound difference. Installation took 1 1/2 hours.

 

[GottaBoss]

This will definitely be my next mod. And it looks like latemodelrestoration.com will be my source - 309.99 less 5% shipped with coupon code. Why is it that getting sound just right is so difficult?