1. G3 intakes, Berk HFCs, stock cat-back: it was very quiet and nearly stock sounding under 3k rpm but really opened up in volume above that. I easily felt the power gains, and still remains the biggest seat of the pants power increase of my powertrain mods. It had some hiss but it was a great setup to start modifying your intake/exhaust as it is nice and tame but sounds much more pronounced when driving harder.
2. G3 intakes, Berk HFCs, Tanabe Y pipe, stock cat-back: One thing I loved was how it was quiet under 3k rpm but really opened up above that. It still had the same tone as the stock exhaust but was roughly double the volume. It had a fair amount of hiss though, and while the stock cat-back kept torque up, it limited hp gains up top. Dyno'd at 309whp/259ftlbs.
3. G3 intakes, Berk HFCs, Injen cat-back exhaust: the first thing that defines this setup; crazy drone. I love loud exhausts but the drone from this setup gave me a headache no matter where I drove and how I drove. The drone was so bad it would vibrate my rear view mirror so much between 2-3k rpm that I couldn't see out of it. It sounded great but it was unbearable, which is why I sold it. Never dyno'd to see if I gained anything.
4. G3 intakes, Berk HFCs, FI 12" resonated exhaust: this is my current and favorite setup, it is pretty much perfect for me. There is little drone and the 'drone' that is present actually adds to the effect as you can feel the exhaust note but it is not overpowering or uncomfortable. It is not too loud when driving normally but sounds fantastic when driving enthusiastically. I'm considering swapping the resonators for the non resonated center section just to get a bit more volume. Dyno'd at 320rwhp and 262ftlbs.