Installing exhaust, need help
 

Ok first what size wrench to remove the 02 sensors and also I have a bad A/C compressor anyways and it doesnt blow cold can I remove the two AC lines on the passenger side cause I'm having trouble wit clearence I have MAC equal legnth short headers, please help.

I think the O2's are 7/8.
Take the car to a shop to get the AC drained if you must remove the lines.