What can cause exhaust back pressure?

What can cause exhaust back pressure? Is exhaust back pressure good or bad? Conventional wisdom says exhaust backpressure is bad. If you want to maximize horsepower, the thinking goes, you have to minimize backpressure. Consider the ultimate low-restriction exhaust system: A Top Fuel dragster like the one you see above. As it turns out, backpressure … Continue reading What can cause exhaust back pressure?