When selecting your exhaust kit, or components, it's critical to size them appropriately. Selecting a system that is to small, will restrict air flow at high rpm's and limit your top end power. Selecting a system that is to large, reduces back-pressure, which decreases low end torque. We recommend following the chart below, as closely as possible. For example; if your motor is making 225 HP at the rear wheels, you'll need a 2.5" single, or a 2.0" dual. Or if you have dual out...
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