Just installed my DT LTs, stock mid pipe and jba cat back and sound is not what I expected. Seems to have drone most of the time driving around town and on the interstate and hardly any sound at WOT. So basically i have all noise when i dont want it and no noise when i do. What gives?! Should i replace the muffler? I want noise at wide open throttle and no noise going down the interstate at 2000rpm. Seems like most of the noise is at 2K and too quite at 4K. Thinking maybe a borla muffler?