cat/02/exhaust. options?

[davig28]

hi, ok, i give up trying to find the info im looking for so i hope its alright i started a new post. i just cant come to a final conclusion from other threads.

2001 4runner 3.4 5VZ-FE

so, they stole my cat, cut the rear 02 sensor with it. left me with a big ol chunk of exhaust missing.

but i have options, best of wich would be to take it to toyota for certified oem repair. but cant afford that.

was thinkin about getting the magnaflow direct fit cat, it would have a place for the sensor to just bolt right into. found it for 250$ on amazon.

or im gonna weld a pipe to connect back with the muffler and just leave the cat out for now, use the URD 02 simulator. but they are tellin me that the engine needs both 02 sensors present and working for the engine to continue functioning properly. so in that case, i would have to install the downstream sensor as well. but how far back? would it matter, since i am using the sim as well? from what i hear these sensors are important to give info to computer about fuel/air, keep everything tuned, so the spacing would matter wouldnt it?

any ideas or advice?

1. how far back after the cat, or down the exhaust flow, does the rear sensor need to be?
2. do you think the magnaflow cat will work well with my runner?

thx in advance.

 

[Stick Figure]

rear o2 won't effect the air fuel reading that is the front o2 only. Rear is really just catalyst efficiency, which can be simulated by the o2 sim that you were talking about. You will either need to have a sensor in or resistor across the heater wires to keep from throwing that code as well.

As far as the magnaflow, I tried one of there high flows on my IS300 and the element was rattling inside the pipe in around 6 months.