Well I removed the muffler from my 78-308gtb. I cut a whole in the top under the heat shield.I now know why you get more exhaust from the driver side as opposed to the other.The 2 come in off the cats into a common area in the top half (where I cut) of the muffler.They combine and pressure forces it through the holes in the plate you are looking at.It then gets forced through at the bottom of the muffler on the right (in pic.passenger side when on car.muffler is siiting as mounted in car and up is up).It then goes to the right through a chamber and into the large tube(you cant really see it here but there are 2 tubes under the plate with the wholes 1 large 1 small) it then passes through this tube to the other side of the muffler into a common area which then goes to the 2 tips on the drivers side,then there is a smaller tube as mentioned,that takes whats left back across the muffler and out the 2 tips on the passenger side.This is why the drivers side blows harder as air,gas etc. under pressure always takes the least path of resistance.They should have made the inlets to the tips on the drivers side smaller to balance the release out of both sides.Now if I want I got to remove the 2 tubes and see if the bottom one is collapsed inside or blocked as I suspect.I get almost no exhaust from my passenger side.If I tear it up anymore it will be very hard to weld back together.Any questions please post.
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