Compliments of Larry Meaux's (Max Race Software) PipeMax program

--- Single Primary Pipe Specs --- for CID for 382.668 m 4300 to 6800 RPM
Diameter= 1.721 Length= 31.3 to 34.1 also 21.9 to 24.6 inches long
Note> Maximum Primary's Tuned Length= 52.3 to 55.0 inches long

--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.161 Tuned Lengths= 17.9 best and also 9.0 or 35.8

H-Pipe= 17.9 X-Pipe= 71.7 distance behind end of Primary Tube ends

-- Total Exhaust System Tuned Lengths (Primary ends to TailPipe end) --
Best HP/TQ Tuned Collector Lengths= 17.9 , 35.8 , 71.7 , 143.4 inches long

Worst HP/TQ Loss Collector Lengths= 26.9 , 53.8 , 107.5 , 215.1 inches long

Note=> measured from where the Primary Pipes end inside the Collector to
the point the tailpipe exits into the atmosphere.
H-Pipe is located at end of Collector, and X-Pipe is located
usually half-way between end of Primary Pipes -to- tailpipe end

Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness

---- Primary Pipe's Harmonics ----
1st Harmonic = 137.7 inches long ... typically never used
2nd Harmonic = 52.3 inches long ... longest recommended
3rd Harmonic = 31.3 inches long ... highly recommended , best Torque Curve
4th Harmonic = 21.9 inches long ... shortest recommended
5th Harmonic = 16.5 inches long ... typically never used
6th Harmonic = 13.0 inches long ... typically never used
7th Harmonic = 10.6 inches long ... typically never used
8th Harmonic = 8.8 inches long ... typically never used

---- Collector's Harmonics (includes Intermediate, Muffler , TailPipe) ----
1st Harmonic = 143.4 inches long ... longest with Mufflers and TailPipes
2nd Harmonic = 71.7 inches long ... longest recommended with Mufflers
3rd Harmonic = 35.8 inches long ... more bottom-end Torque
4th Harmonic = 17.9 inches long ... highly recommended , best Torque Curve
5th Harmonic = 9.0 inches long ... reduced Torque , more top-end HP sometimes
6th Harmonic = 4.5 inches long ... reduced Torque , not recommended