It worked wonders! My nine T is one step closer to free breathing! I was wondering though, did you guys remove the db killer AND the db killer cap, or did you replace the cap afterwards. Because I think the cap itself also muffles a bit, but I dont really like the look without it.
Update: decided to remove the caps anyways, just need to clean them a bit. Sound isn’t louder, but way darker. I love it!
I replaced the caps on my 2014, didn't seem to make a difference to the sound (but removal of the baffles did). Glad you got it sorted, maybe think about sticking some copper grease on the bolt threads so they aren't as difficult next time you want to take them out