For those stating that by removing the cat you will loose power, you are clueless. You gain power by removing restriction. Either get a tune that turns off the rear o2 sensor or install an o2 cheater to trick the ECU.
Please do some research before giving others advice.
Catalytic converters need to reach and maintain a certain temp to work. That is why they are positioned close to the engine. Moving them further from the engine renders them useless.