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Just to add to what some of these guys said unless you have a turbo then you will see little to no gain or some loss depending on the age of your engine. I have a turbo and I have a full straight front pipe and yes there was mad gains like mentioned. I am in Japan there emission testing here does not envolve any U.S. related emission testing Org. That is why it is so hard to get some of these cars into the states. emission testing NO matter what state you are from it is mandatory. It is not worth it to your engine to go catless either.
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