PipeMax 3.89. For a 505" stroked 440, Trick flow heads, Solid roller 243/249 @ 0.050", 0.616"/0.624" lift, 110 lsa cam installed at 106 icl.

Street header with muffler:
primary total length 41.1 to 44.0" Tube dia in the 1-3/4" range.

Tri-Y street header with muffler:

2-step: First segment 20.6 to 22.0" (1.651 dia), second segment 20.6 to 22.0" (1.776 dia)

3-step Higher RPM: first 20.6 to 22.0 (1.776 dia), second 10.3 to 11.0 (1.901 dia), third 10.3 to 11.0 (2.026 dia), same cpmbined overlength of 41.1 to 44.0", collector about 3", 22.9" long

The Tri-Y race with or without muffler is same overlengths, just slightly larger tube sizes.