[Formulajones]

The sound quality with this system will change drastically depending on the engine combo and whether it has headers or manifolds.

On my Firebird, when I took the long tube headers off and went back to the RA exhaust manifolds, the exhaust actually got louder. The headers do a better job of scavenging and smoothed the exhaust tone quite a bit. It got a bit more "slappy" with the exhaust manifolds in place but still comfortable inside the car.

Here is my bird with stock 400 and this system, with RA manifolds in place.

https://youtu.be/uIFkggwDY-8

Same setup at the track inside and outside the car.

https://youtu.be/er1z7PpqsnY

https://youtu.be/XqEydRRRwqE

Same system on a 455 Pontiac, this one having RA exhaust manifolds. Sounds better on this Formula than it does on my 400 Formula.

https://youtu.be/AOqwz3QlO5k

Here's my other car with the same system. This is a SBC with headers and sounds quite a bit different.

https://youtu.be/47HgejCVbFs

Same system on our Z, and I did all kinds of different stuff with this one. Factory exhaust manifolds, then headers. Then did the supplied 2 1/2" tailpipes, then switched to factory 2" tailpipes which toned it down considerably, took some of the deep tone out of it.

https://youtu.be/5dTNw93VPEQ

https://youtu.be/IZ0HlEY7b74


Personally, for my taste, I think this system sounds better with a SBC in front of it but I have no complaints with the Pontiac.