Can anyone tell me exactly what bosch (dunno if I spelled right) o2 censors do, how much they usually run for and if they improve performance or not

 

it's just a simple sensor to measure the air going through the header, upgrading to a bosch isnt a huge deal. Buy whatever your local shop sells, get the universal one, save $10 and wire it in yourself.

Dr.

 

Why is this in "motorsports/Drifting"?
Any way...Bosh O2 sensors are *** for the most part(I have tested one out of the box and it was nearly dead) NTK (made by NGK) are your best bet...as for o2 sensors they are very good.