An H-pipe is what connects your exhaust manifolds or Headers to your mufflers. This is where your catalytic converters are located. The stock H-pipe has 6 cats, 3 on each side. For less restriction and more power, an aftermarket H-pipe is recommended. You can get them with no cats(off-road), or 2 or 4 cats to stay emissions legal where you live. An aftermarket H-pipe is the best exhaust mod you can do for more HP at a reasonable price.
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