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[rdass623]

you can add o2 sensor bungs for the front sensor, which controls your mixture. the problem comes in with the rear sensors, you will need to add catalytic converters after the headers, there are some available which could be added into some cat bypass pipes or if you have a local shop which is willing to do a bit of fabrication it can be done. I simply added set of secondary cat delete pipes and a e-bay muffler (obx racing) and the car now sounds great and my butt dyno says I have a bit more midrange power and better throttle response, but it may be just the cool sounds coming from the rear of the car.