[jhein]

Originally Posted by napster

John,

I think what is holding back the idle is the X-pipe. I have changed all my cars to H-pipe. each car's idle was held back in terms of deep sound and the lope of the idle. In each case, it changed the sound to the way I want the car to sound like a muscle car.

Here are a before and after video of my 1970 GTO running a 461 with the off the shelf XR 288. It is the same cam you have except the LSA is 110.

Before:
https://www.youtube.com/watch?v=EoYVfvmtuX8
Exhaust is Magna Flow with X-Pipe

After:
https://www.youtube.com/watch?v=GYMaDAeOO3g&t=47s
Exhaust is now Flow Master American Thunder Series with Texas TA mufflers and H-pipe.

Big difference in sound.

I remember that you mentioned that before. There's a big difference in sound for sure on the videos. When I bought my system, Pypes didn't have the H-pipe available. They don't even show it on their website right now, as far as I can find. I'll have to give them a call Monday.