It’s an accepted part of hot rodding lore that headers help make more power and torque on any engine versus the typical stock cast manifold, but do you know why? Before you throw down some hard-earned hundies for a set of tubes for your car, it pays to have a basic understanding of what you’re getting in return and why. If an internal combustion engine is just an explosion-powered air pump, then how the air exits the engine is just as important as how it gets ingested.

It’s more about optimizing how the exhaust exits the engine’s combustion chamber, but there is much more to it than just using the largest pipe possible.

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Here’s a quick table that shows how many CFM each common pipe size will flow, as well as the estimated max horsepower for each pipe size: The table above is probably over-estimating pipe size, but you can see that a 400 hp vehicle with a dual exhaust system only needs 2 1/4 – 2 1/2 inch pipes. Great forum discussion that really discusses the details of the scientific calculations: While we’re not going to go through and list out all the formulas and calculations you need to figure this , we will break down the problem, explain how you would go about figuring things out scientifically, and then leave you with some good quick-and-dirty exhaust system math as well as some interesting links. 1) Mass of air that the engine breathes in mass of fuel = mass of exhaust gases Conservation of mass, right? Single regeneration budgets 1997 2) To calculate the volume of air the engine takes in, we multiply the displacement of the engine by the engine RPM and then divide by two (it takes two full revolutions for the engine to exhaust it’s entire air volume). 3) To make the calculations easy, you want to assume that combustion is perfect, i.e.Tri-Y Long-Tube: Tri-Y headers came to popularity when they were used by Shelby for the GT350 Mustangs.The tri-Y design combines a short primary that is paired with another cylinder that is synchronized in the firing order into a 2-into-1 collector that steps to a larger diameter secondary tube.

## Single chamber flowmaster ls1

The factory exhaust pipe diameter is usually a good choice for most vehicles. The muffler manufacturers are doing all the math for us – no need to reinvent the wheel.If they say it will work for your vehicle, it will probably work for your vehicle. We’ve got an easy-to-read exhaust system size table that is good for quick calculations.If you’re a math wiz and/or an engineer, you’re probably going to like this article and the resources we’ve linked to.However, if you find yourself getting stuck (or bored) with the info below, here are the key take-aways: 1.The dealer number and today's date must be present on the badge.

Magnaflow’s Lifetime Warranty will only be honored on product purchased through an Authorized Retailer.Easy Way To Estimate: Your intake system needs to flow 1.5 CFM per engine horsepower, and your exhaust system needs to flow 2.2 CFM per engine horsepower.Good Way To Estimate: Take engine RPM x engine displacement, then divide by two. Use this same volume of air for the exhaust system, but then correct for thermal expansion (you need to know exhaust temps to figure things out).As the piston travels through the exhaust stroke, the burned gases are expelled past the open exhaust valve and into the exhaust manifold.By nature, manifolds have very short runners that dump into a common plenum (or “log”), which causes the gases from each cylinder to build up pressure in the manifold.