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Originally Posted by NissanTracker
I'm actually in the same boat. Supercharged with TG's A-A kit with Motordyne TDX2. I was blowing cats so went to FI resonated test pipes. Loud as hell.
What I did was added high flow cats further down stream to the Y pipe. 2 100 cells on each side. I also added Hemholtz resonators to the test pipes (similar to the Motordyne ART, but with additional resonators on the FI TPs).
Helmholtz resonators help a ton. Just bottle resonators with caps on them. Technically they need to be sized to cancel out rasp/drone. They do a great job adding a deeper tone.
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My FI exhaust has the 18" resonated X pipe, 14" touring mufflers and 100 cell cats. I'm running Motordyne ART test pipes and headers. Don't know what else I can do.
The FI exhaust quieted down the WOT sound level but I get a lot of resonance through the cabin. Not drone per se'. It begins when I roll on throttle (load). In my experience, the situations that set off my tinitus is vibrations/resonance, not necessarily high decibels.
Interested point you make about tuned Hemholtz resonators. I wouldn't know where to begin there.
Ok, as I type, the previous owner messaged me he thought the test pipes were too quiet so he had the chambers fabbed/reduced. Arghhhh! Anybody know the original dimension of the chamber off hand??