TA Dreaming

I figured I would post this here as I consider it more advanced. If this is the wrong place, please move it.

Since I have to design my own headers to fit the car anyway, I figured I'd go with a tri-y design. I'm lowered, want the exhaust to stay hidden behind the subframe, and have ground clearance issues in general. It's a lot easier to get two pipes to stay tucked to the floor boards than four. Besides, I like a challenge and think they will look good. With that said, does anyone have any suggestions or information on pipe length and diameters? What about sources for the components like the flanges, pipes, and collectors?

Engine plans are 383 LT1 with Ai 200cc heads and most likely the bigger cam they offer. I'm building a canyon carving street car so a broad torque band is key.

Thanks