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you can either stretch the stock hangers by tugging down on the piping, or buy new hangers that let the exhaust piping hang a bit lower. i was getting a rattle too with my A'pexi WS2; it was hitting the chassis in the dead center of the car, and also whatever metal is beneath the plastic shield near the rear of the car. this was after installing a race header; had no problems with the stock exhaust manifold setup.
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