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I think it might come down to the angle that the y-pipes connect to the headers. If i remember correctly LS1 headers (when looking at them underneath) branch out away from the transmission as LT1 headers are a little more straight on. Also each companies y-pipe varies as they are typically designed to match headers.
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Last edited by ar0ck; 01-29-2009 at 07:34 PM.
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