[jhein]

Originally Posted by napster

Are you using the original RA III exhaust manifolds? If you are maybe move up to the 2.5 inch oversized manifolds you can get an additional 13% flow. In addition, are you going X-pipe with transverse muffler? Transverse is a bottle neck, that is why I went with two mufflers.

Here is how my '70 sounds like with the RA IV oversized manifolds and 2.5 inch mandrel bent pipes extensions from Pypes into a Flow Master American Thunder system with mandrel bent 2.5 inch pipes and H-pipe. Finally, Texas TA mufflers.

https://youtu.be/AXveB8zehOw

https://youtu.be/IsmQXWoIMSU

Don't know what sound you are looking for, but it might float your boat.

If you want more power, go with the X-pipe for the better scavenging effect. If you want the sound go with H-pipe. I don't race so I go with sound.

Are your tips the Pypes tips? And are they the long or short tips?