The cross pipe works with the headers to help speed up the exhaust flow through the pipe and out of the cylinder. A properly tuned set of headers and x-pipe can actually have the fresh intake charge moving into the cylinder before the piston passes TDC in a high performance engine.
A straight pipe isn't going to hurt anything. The manifold would probably be enough to keep cold air from hitting hot exhaust valves and burning them up. Back pressure in any engine is a bad thing, the less you have the easier it is to move the spent gasses out of the motor. And too much back pressure burns up valves.
To really make any significant performance difference, it would take work on the entire manifold unless you are plugging up the exhaust pipe with what you already have.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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