On the other hand, headers are aftermarket parts designed to replace the exhaust manifold. Headers are usually made from mild steel, stainless steel, Inconel, or titanium, making them lighter than ...

Graph 1: Stock Exhaust Manifolds vs. Headers (Mast-headed 427 LSX) See All 18 Photos Having power gains is always good, but it is even better when those gains occur through the entire rev range.

With 1x3-inch headers, 2.5-inch dual full-length exhaust pipes, and modern performance mufflers, I'd expect about a 10- to 20hp gain over stock cast-iron manifolds.After all, your cam has about 30 ...

The design of the header is key to releasing the hidden horsepower found in our Coyote engine. Our 2018 Mustang was slightly different from previous S550 Mustangs (2015 -17) but much of what we ...

Dyno DuelWith exhaust options now running the gambit from stock iron manifolds to short tubes or full-length headers, the question becomes which one to use.We wanted to know how they stacked up in ...

The headers feature mandrel bent 1 7/8-inch primaries, a three-inch collector and a 2.25-inch connection to the stock exhaust outlet. ... The stock header outlets and cat inlets are both 2.75″.

After swapping the stock exhaust for the long tube header version, the same car made 410 horsepower and 417 lb-ft of torque on the dyno, a gain of 26 horsepower and 28 lb-ft of torque.

No car enthusiast wants a poor-performing, quiet exhaust. This is the single best mod to improve both in one go.

Behind the headers, a so-called five-exit exhaust utilizes the E46 M3’s stock quad tips with the option of an open exhaust dump. Hearing the V10 at full chat will be an experience to behold.