doesnt every one
ive got about 4 lc1's (2 wont talk to the programmer fk knows why) and 2 i use for V8's. My old LM1 seems to be the most reliable and is used for auto tune ecu's.
I get about 2 weeks from a sensor (my dyno uses the same sensor) bear in mind it runs 8 hours a day and gets hammered by vibration and sooty cars. The heat sink is cool and i use one for tuning alot of the jap turbo kits where the sensor is about 10cm's from the exducer.
I would fit the sensor about half way between turbo and cat, they dont like impact (rocks, constant water spray etc) so it is nice to have it up a little.