So I went and sound insulated my trunk. Vast difference! I had a peak resonance around 500hz and it dropped 6 db. Huge difference. I still hate the sound. To me it sounds like an old crappy car with an exhaust leak not a V8 performance car. LOL. Our cars just don't sound good. But I can live with it. I put panels of dampening on the large metal surfaces to stop their vibrating. Then used a roll of Mass Loaded Vinyl to block the sound. Then finished up with a layer of jute padding to absorb sound. All under the trunk carpeting floor, sides, and underside of trunk lid. It made a substantial difference. Stop the vibrations, block the sound, absorb what gets through.
In my opinion the perfect setup would be the ZZP 2.5 without mufflers and use Solo Performance mufflers. I am not too interested in cutting off my brand new Borla mufflers to spend another 500 bucks to swap mufflers so I will live with what I have. But if I did a do over I would have went with the Solo Performance mufflers for less noise but still 100% stainless and good flow.
