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They are designed to go into the muffler so the pipe is 3"od but any shop can flare them to 3" id so pipe slips in or you can use a band clamp so i guess to answer your question you can install them with clamps or weld no matter the connection
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[/SIGPIC]10 2ss ls3 sw long tubes,cai intake,phastek scoop,se3" exhaust,elite e2, bw stg2tb, tsp f35, motive 4.10 lpw cover, 15" conversion, 510whp tuned by john donovan
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