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also, the 6-speed exhaust uses 2 1/2" tubing and a H-pipe while the auto system uses 2 1/4" tubing and a X-pipe. the auto system uses that huge suitcase muffler. it is needed because of the MDS. when the engine drops 4 cylinders, the sound completely changes. the suitcase muffler is designed special to be really two systems into one case.
 
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