HA! Seems to be a trend here. I think unanimously everyone agrees that the stock Z4M is way too sedate (sounding). Even a friend of mine that was driving behind me said "your car is all engine, no exhaust". I tried the Diablos, but the drone was frankly unbearable. I want something that is sedate (OEM-ish) during normal driving, but more ferocious when you get on it. I'm going to try the intake route next as I had good luck in other cars.
The Remus sounds like a good option, but not sure I want to drop $1200+ just to make my car sound different.
GammaZeta, if you want to sell your AFE, I'm interested