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Posts: 27
Since: 8/5/2011
Status: offline
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I have fitted x-pipes to various cars as part of my "day Job". They do work well, not always in an obvious horse power gain, but in terms of response and smoothness of power delivery. The theory is a similar pinciple to the old ford GT40 exhaust system. I.e, the pipes are configured so as the gases of the preceeding firing cylinder "pull out " the gases from the next cylinder in the firing order. An X-pipe works in a similar way. On a "V" configuration engine, there should always be a pull effect in the exhaust system. I dont know what the cost is of the pipe you are looking at, but within reason they are worth considering. Hope this helps.
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but you are right about the sound. As far as I can tell there is no difference. Perhaps as Andy says there's a power gain. 