I've had a BMC CDA on the car for a few weeks, and it makes a lovely lovely noise.
BUT! Had my car on a Dyno on Sunday afternoon....
With, BMC CDA...
Run 1, 164BHP! That's right, 164! This was a calibration run, so pinch of salt required!
Run 2, 178BHP! Better, but still crap really!
Run 3...