Depending upon your vehicle and the system you choose, an after-market exhaust can add as much as 50 horsepower or as little as 2 or 3 horsepower. Here’s how you can figure out what to expect. Horsepower is calculated by multiplying torque by RPM.Click to see full answer. In respect to this, does exhaust add HP?Horsepower is calculated by multiplying torque by RPM. Therefore, if a new exhaust system adds just 10 lb-ft of torque at 5,000 RPM, that will result in a horsepower increase of 9.5 hp.Subsequently, question is, how much HP does a MagnaFlow exhaust add? MagnaFlow, an aftermarket exhaust manufacturer, says that its customers can expect horsepower gains of around 10 percent (which is a pretty commonly-quoted figure). Similarly, it is asked, how much HP does a cold air intake and exhaust add? Some manufacturers claim as much as a 5- to 20-horsepower increase for their system. But if you team up the cold air intake with other engine modifications, like a new exhaust, you’ll create a much more efficient system. So think of it as just one part of many to increase your engine’s performance.How much HP does a Borla exhaust add?Borla exhaust systems are designed to have the optimal diameters and low restriction flow that promote scavenging. The Borla R&D team performs dynamometer testing on new parts to ensure power gains. We frequently see gains in the 8 to 12 horsepower range, sometimes much higher.

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