mine got really loud just like yours so i had my dealer contact fass and even though it wasnt under warrnty they sent me a new one for 170 and boy is that thing quiet
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99 DODGE 24VALVE, FASS 150,
EDGE COMP/SMARTY REVO STACK ,BHAF,TC LOCK SWITCH,DTT TORQUE CONVERTER, BUILT TRANS, 5"MITER CUTS, 3.55 ANTI SPIN ,SMOKE SWITCH, SILENCER RING KILLED, GAUGES (FUEL PRESSURE, TRANS TEMP, BOOST, EGT))INFAMOUS 53 BLOCK 270,339 no crack