As much as we like the 5.9L Cummins powerplant, the stock exhaust manifold is constrictive and contorted, interfering with the flow of gases to the turbo and downpipe. That, in turn, can produce the ...

Optimum exhaust flow is critical to maximizing the efficiency of any engine. After all, an engine is just a sophisticated air pump – and the easier it is to move air in and out, the more efficient the ...

Aftermarket intake manifolds like those made by Edelbrock Corp. (411 Coral Circle, El Segundo, CA 90245, 213/322-7310) are engineered to make the engine run more efficiently, due to more uniform ...