well the mac performance catback is for single cat cars, and it says with its true fit system its fits perfectly well could it fit a car with dual cats? i mean everything looks the same, and my father also had a ravin catback installed , loud but not enough for my tastes and i was just thinking could i jsut use the pipe thats already attached to my stock cats from the ravin exhaust? and both both mufflers have the same inlets and outlet sizes