Cat bypass pipe?
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Cat bypass pipe?
Was looking at performance options thats out their for subaru impreza RS since im hopefully getting one in next couple months. I noticed the exhaust systems available, and they seem to include piping that bypasses the catalytic converter. I know if you dont run a cat on most 4 cylinders the motor backfires a lot. Is this the same with subaru's Horizontal motors? Just curious. roy
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