1976 Avanti exhaust pipes

[Penn Avanti]

I am getting my 76 Avanti back on the road. I have part of the exhaust system installed up to the catalytic converter outlet pipe that goes through the hole in the frame but I don't remember where the system splits from there and where the muffler goes. I am trying to keep the system stock. Any information would be welcome.

Roger

[mfg]

Hi Roger....On my '83 the cat fits into the passenger side portion of the 'X'...then the pipe that exits the converter (and the X) splits into a 'Y'...which feeds into twin mufflers that feed into the tailpipes./

[Gunslinger]

Depending on your state laws regarding cars of that age, you can just remove the catalytic converter and simply run a full dual exhaust system as pre-cat cars had. If you want, you can install a performance converter in each down pipe if you want. They're not that expensive. A good performance shop can do that.

[Penn Avanti]

There was a change in the exhaust routing because the cars in the 1976 range split the pipes after the X member and I would like to maintain that arrangement if I can. The question is where was the muffler, just behind the X member on the right of the driveshaft or under the trunk like the '76 Camaro?. I do recall that some of the cars had mufflers under the trunk area but don't remember which ones. Straight duals w/o cats probably won't work here in VA, especially if the car gets state inspection.

Roger

[Gunslinger]

Does the exhaust split into duals with two mufflers and tail pipes after it exits the converter? Many cars did that...the '78 Corvette I once owned was set up like that. Some cars have a catalytic converter that has two inlets and two outlets or one inlet and two outlets.

Maybe someone with an Avanti of that era can confirm what the factory did.

[mfg]

There was a change in the exhaust routing because the cars in the 1976 range split the pipes after the X member and I would like to maintain that arrangement if I can. The question is where was the muffler, just behind the X member on the right of the driveshaft or under the trunk like the '76 Camaro?. I do recall that some of the cars had mufflers under the trunk area but don't remember which ones. Straight duals w/o cats probably won't work here in VA, especially if the car gets state inspection.

Roger

Please re-read post #2. If your Avanti originally had a 'cat', I'm sure this would be how the exhaust system was set-up...Once again, the twin mufflers connect up to the y-pipe ends, then the twin tailpipes fit into the ends of the mufflers.

[mfg]

Depending on your state laws regarding cars of that age, you can just remove the catalytic converter and simply run a full dual exhaust system as pre-cat cars had. If you want, you can install a performance converter in each down pipe if you want. They're not that expensive. A good performance shop can do that.

Roger expressed an interest in keeping the exhaust system on his Avanti ORIGINAL Gunslinger.