I used the Bosch part number 15733 universal o2 sensor,its only 56$ @ oreillys.Now it do come with a you build it connector but with a little patience you can use the stock connector the sensors wrk great,they say the range is 0 to 0.8 volts the sensor will read upward to 1 volts which is what i am getting that translate to like a 11/12 something air fuel ratio..For the price of one sensor I got two so just a little info on the universal sensor yes they do work great on a modded srt6.