6" SS EXHAUST STACK

[Gregory OConnor]

Way cool. I stopped following the thread when it got mathy. Sounds
like your brother reads the exhaust as over max flow 'as it is' and
even at 5 inch, max threshold is not reached. do the calcs account
for air at intake then the expanded air volumn after the piston
fires hot? not that it matters much.
I can see first hand that exhaust mods make a big diff on my dirt
bikes. and always figured they must show some result whith folks
making expensive aftermarket changes on new diesel pu trucks. I
guess Kurt is thinking the bluebird is undersized like pickup trucks
and stock bikes are also. there has to be some data on this as the
series 60's have been tuned up to major horse power in boats. I
think ending all the turbulance caused by a cracked pipe has to be a
big improvement on Kurts economy. Building a modified exhaust wont
prove comparison to a stock exhause because Kurts has a flaw. (there
is no control)increased hp and low end torque over that engineered
is something I fear will prove issue with a 5 speed 50,000 lb bus.
unless you build it for economy and turn off some horses to that
proven ability of the allison.

Greg94ptca