Search there was a thread about this.
Most importantly though soak the o2 sensors with pb blaster. Crack them loose adding more pb and tighten. Do this a lot, each time backing more out and adding more pb. If not you may strip the threads (they are m18x1.5mm) Mine had 3000 miles and they were a b****.
Other than that its straight forward really. I did it on my back (no lift) with a catback in 4 hours I think.
Oh yeah the o2 wire connectors are over the drivers side axle or some wacky spot also. Undo them from underneath before you unscrew the sensor.
Use a half inch drive impact gun with a swivel and semi deep 14mm to break the 5 turbo bolts loose as they are really tight and a ratchet or wrnch will most likely round them.
I got mine instaled today took me 2-1/2 to 3 hours. The but dyno tells me that it made a little difference, that means I need to get the racing cut out soon.
cel = idiot light = check engine light whatever you want to call it. I havent had any problems with second o2 sensor yet. No you dont have to drop the crossmember however you need to drop the cross bracing.
