Innovate LC1 is the best option if you want to leave the sensor hard wired into your dump pipe. If you are just using it here and there, the LM1 (or its successor, the LM2), is the better option. The LC1 can be had for $260 - http://www.ausperformance.com.au/store/ind...mp;productId=21
The LM2 is a fair bit more expensive, at $620. Whilst I recommend this unit for people who only want to tune their cars every now and then, it isn't worth the money unless you are tuning other people's car's as well.