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I have a 1992 550 sx and have several pipes on ebay that I am wanting to buy. Will I need a different manifold? There are some kerker and pjs and westcoast pipes and some are sold with the manifold. Also will I need to rejet or can I run the new pipe with the stock jets safely without seizing the motor. Anyone have any info on the three pipes above and which one is the better for all around. It would be great if I did not need to change the manifold out and the pipe would bolt right on. Does any one make something like this?