Right, this might be waaayyyyyy off topic (even for the Chit Chat section), but given the diversity of members within MDL, thought I d give it a try My idea is to have a constructive discussion / comparison on the currently available top options for digitally measuring AFR: AFX (NGK) SM-AFR (PLX) MTX-L (Innovate Motorsports) Wideband O2 UEGO (AEM) Each of those - with the exception of the AFX - come with the 'standard' Bosch 4.2LSU sensor. The AFX is supplied with a ... NGK sensor (but is also compatible with the Bosch) Key factors for this discussion are accuracy, longevity (of the sensor ... & gauge / harness as a whole) and easy of use / practicality (i.e. calibration, output data etc). So judging upon how cool it looks - is n/a for this discussion In order to try and get some valid points here, please reply only if you are absolute familiar to any of the above systems I mentioned i.e. meaning that you have to personally owned one for a respectable period of time. That might limit the number of responses, but it's the only way of drawing some useful conclusions about the actual product p.s. I know that the MoTeC is the best - but it costs 1600USD more...