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 - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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