WELL IT SOUNDS GREAT WHEN ALL 8 ARE FIRING . BUT WHEN MDS ENGAGES IT SOUNDS LIKE ITS RUNNING ON 4 CYLINDERS KINDA LIKE IT HAS A COUPLE OF MISSES.IT LIKE ECHOS IN THE MUFFLER.KINDA LIKE A DISEL TRUCK DOWN SHIFTING.IT DOES BUMB ME OUT ON STREETS WHEN YOUR CRUSING SLOW SO I PUT IT IN 2ND GEAR AND IT DISENGAGES . ON THE 06 THERES A BIG *** RESINATOR RIGHT THE COLLECTOR FROM THE Y PIPE THEN THE MUFFLER THEN THE SMALL RESENATOR ON THE TAIL PIPE. SO IF YOU HAVE STOCK YOU WON'T NOTICE HOW IT FIRES THEY ARE PRETTY QUIET. I THINK IF I LEFT THE TAIL PIPE RESENATOR ON I WOULD NOT NOTICE IT AS MUCH. BUT YOU GUYS ARE RIGHT I DODN'T FEEL IT BUT I DO HEAR IT. HOPE THIS HELPS . TOM