Alright, so I went to an exhaust shop Friday and had them install some Helmholtz resonators. I had to do the math for them, but I came out to needing about a 25" long resonator. The muffler shop I went to was great. Really cool mom and pop place. Overall, the car is a little quieter, sounds a little different, and part of the drone has gone away, but not completely. Aside from exhaust tips, I think I am going to stop messing with the exhaust. Let's face it, I'm throwing 500+ hp through a tiny tube. I'll just cruise at 60 mph instead of 70 mph. I'll save gas anyway.