These SLP headers have 1-inch primaries that dump into a 3-inch collector. Made from stainless steel, they're advertised to produce an extra 23 hp and 21 lb-ft at the wheels. The set pictured has an ...

It takes energy to push disorganized exhaust gases out through a vehicle's stock exhaust manifold. Headers don't make horsepower; they relieve the engine from the task of straining itself while ...

After we bolted the Lester Scruggs 404ci engine into our Orange Peel '66 Chevelle using Edelbrock motor mounts and headers, it became obvious that the leftover 21/2-inch exhaust system was due for an ...