I'm installing some LT's and some high flow cats. I'm keeping all the O2 sensors. So will I need 2 or 4? Or some other weird number haha. Thanks

 

One for each down stream sensor (after the cat).

 

Ok thanks

 

Also how long should they be? I've been reading 12" is good for both, and someone even said that one should be 12 and the other should be 24. What're your experiences gents?

 

hey dude, well for the from ones i got one 12 and one 24, the 12 is just right, the 24 is a bit long, but you could maybe get away with both 12", but would say if you can get two 14" it would be good. These are for the FRONT O2's before the cats. If you are NOT tuning the rear sensors out you will prob be ok as the location after the cats is similar. I removed my cats and tuned the rear O2 out so no probs here

 

here you can see the driver side is LONG

 

Sweet I found some 18 inchers at Summit so I might get those