Being a low mile original car I'll assume you aren't looking for aftermarket upgraded exhaust systems, even though there are a couple of excellent crossflow systems out there that I use and am very happy with. Pypes and Dynomax.

Dynomax offers the transverse mufflers separately, and they have a very nice sound without being obnoxious or overly aggressive, and also have the correct flow path as OEM (Pypes is different) but they are 2 1/2" inlet and outlet.

The OEM system are only 2 1/4" inlets with 2" outlets. If you want to keep those sizes and correct appearance/fit then Waldron might be another option.

They sell just a transverse muffler, said to flow a little better than a stock muffler with internal dimensions larger than stock, and will make them to any inlet/outlet size you want, in aluminized material or stainless steel. However I do not know what they sound like, I've never tried one myself.

http://waldronexhaust.com/cart/index...oducts_id=4689

http://waldronexhaust.com/cart/index...oducts_id=4690

Love to know what the waldron "Impostor" muffler sounds like. Stainless steel with stock outlets sizes for factory style tailpipes could be a nice compromise of performance sound and stock looks from behind.

I agree, this could be the of both worlds, if only I new what the muffler sounded like ? I appreciate all the input from everybody . Same goes with the Joey's Muscle Cars set up , seems to be a quality / cost effective set up , but the tone of the muffler is still a major concern

My plan is to try one of those at some point on one of the cars.

I currently run a complete Pypes transverse system on our Z, reasons are 2 fold. I wanted a performance increase with larger piping, mandrel bends and an "X" cross over, and I had planned to run the car in PS and the rules allow such an upgrade. However stock appearance is important to me so I grafted in the stock 2" tail pipes to keep a stock appearance when looking at the car from the rear.

https://youtu.be/IZ0HlEY7b74

I have several second gen Camaros, with various exhaust systems. I recently put a Joey Gray exhaust system on a stock L78. It sounds bad to the bone! I am very happy with it. I just bought 2 more mufflers from him at Carlisle.

Good to hear , as I was leaning towards getting one of his complete exaust systems .My only concern was the tone of his muffler ?! Does he have more than one muffler option ? Thanks for the input

Always great to get firsthand feedback. Does your L-78 car have headers or exhaust manifolds?

Check out Waldron exhaust sound clips here

https://www.youtube.com/user/WaldronExhaust/videos

stock exhaust manifolds with smog

Great link. They have a 69 Firebird with the Imposter muffler which is their loudest and it's seems quite fine. Sounds healthy without being too loud.