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    HELP!! IM STUMPED!

    I DRIVE A 1989 GMC K1500 EXTENDED CAB I WAS LOOKING TO UPGRADE THE EXHAUST ITS GOT SOME KIND OF CHEAPY FLOW MASTER SINGLE TO DUAL MUFFLER. IF I WANT GLASS PACKS SHOULD I PUT ONE GLASS PACK THEN Y FOR DUALS OR PUT Y THEN DUAL GLASSPACKS . SORRY BOUT CAPS. ON WORK COMPUTER AND NO WAY TO TURN OFF
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