I think O2 sensors determine the carbon minoxide(sp) being expelled from your car. Technically you don't need them, but you'll have the nasty engine light on and you wouldn't know if something else is wrong with your car. Just get MILs and be done with it if you plan on going with an O/R Pipe. If you just want to unplug them from your cats...why do that?
yes you do need O2 sensors. they moniter the air fuel ratio and you car will run like crap without them. they are required for any car with fuel injection or a feedback carb. you WILL fail emissions testing if you dont have them. and considering you have a saleen supercharged motor you would be a complete moron to not use O2 sensors.
now rear O2 sensors you can do without. all they do is moniter the efficiency of the catalytic converters. they were required as part of OBD2. however depending on where you live you will fail emissions for not having rear O2 sensors. you can get MIL eliminiators which mimmick the signal that teh rear O2's give to the computer, however those will also fail a good visual inspection.
yes you do need O2 sensors. they moniter the air fuel ratio and you car will run like crap without them. they are required for any car with fuel injection or a feedback carb. you WILL fail emissions testing if you dont have them. and considering you have a saleen supercharged motor you would be a complete moron to not use O2 sensors.
now rear O2 sensors you can do without. all they do is moniter the efficiency of the catalytic converters. they were required as part of OBD2. however depending on where you live you will fail emissions for not having rear O2 sensors. you can get MIL eliminiators which mimmick the signal that teh rear O2's give to the computer, however those will also fail a good visual inspection.
To add to the above post, you need functioning REAR o2 sensors for MIL Eliminators to do their job correctly. MIL eliminators don't replace O2 sensors, they piggyback and alter the signal, into fooling the PCM into thinking the cats are functioning correctly. You only need them if you are running no cats, or certain aftermarket catted race pipes.
u definately need 02 sensors and also u might need some extenders. i just installed an offroad h pipe and i have an 04 gt. i got the h pipe from a guy with an 01 gt and the rear 02 sensor on the drivers side is too short to reach where they need to put in. i had to buy some extenders to make it work. but yes 02 sensors are a must if u wanna pass emissions.