No, I don't think I have ever heard audible detonation from my car.

 

My PLX M300 I've had for bout a year now, I advise you to put the 02 sensor eighter in your Ypipe or one of the exhaust primaries to get a very accurate reading. I noticed that my A/Fs where different when I had the sensor mounted in the "behind stock cat" 02 sensor bung on my Bpipe. The readings where off due to a small exhaust leak on my rusty Warpspeed test pipe.

EDIT You can completly eliminate your primary 02 sensor, and use the wideband they include along with the analog output to your ECU. This will save you some $$$ from having a nother bung welded in your exhaust for a 02 sensor. You will need a 20ohm resistor that is MINIMUM of 10Watts to go inline with the postive and negative wires of the 02 sensor heater element of the STOCK narrow band 02 sensor. PLX Bosch wideband 02 that PLX uses is the same unit that VW uses on their 02-up VW 1.8T motors and if I recall correctly is about 39 bux new. If the info isnt clear enough- www.plxdevices.com has more information bout this. I wanted to hook mine up like that for months now, and use the wideband 02 for ECU feedback AND A/F monitoring, but I have alot of things going on with my Q45 and suspension work on the Max that have been keeping me away from installing the 02 sensor like that and finally putting in my EU thats been laying around for 4 months now.

 

That options seems to be better suited to 4 cylinder or inline 6 owners that only have one cylinder bank to moniter. I'd still rather place the WBO2 in the collector so an average reading of all 6 cylinder can be obtained.