Hi JZ, went thru 2 sets of mufflers after putting my car back together, Car would bog, stall and then Talk about explosions! Split like Clamshells. Replaced everything. Make sure its all working properly. Advance, TVS, All vacuum lines, AIR Diverter Valve. 4Deg BTDC, But ended up being the Carb. Might look OK but these Quads will leak and pour gas into the intake. Get a new one or a GOOD rebuilder to take care of yours.
No problems since.