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Cat - Change out your restrictive catalytic converter to a higher flow... allows the exhaust to escape faster. Have to watch your compression tho. Could wind up with lowerd torque in the low end speeds. H stands for hearders. That is where the initial expulsion of waste from the combustion within your engine goes. They then carry it to the cat and then to the mufflers and then into the air for everyone to choke on.
About the exhaust. I had to get the greddy evo. I have a v6 accord so I have to have 2 of the big pipes... not just 1. Also got a new y pipe so the pipes would hug the car better and not look like they were dragging on the ground.
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