ORIGINAL: HankL

I don't believe that shorties are a 'waste'

I think nearly all headers give a 3-6% torque gain
with short degrees of overlap camshafts near 3%
and long duration overlap camshafts near 6%

The length of the primary pipe just determines
at what rpm this gain occurs
short = high rpm (which is fine for racing)
long = mid rpm

Since we are talking about trucks
my own opinion is that the torque gain
should be in the 1500 to 2500 rpm range
and this takes Tri-Y design
with "super long" primary lengths 42 to 55 inches long
which means custom headers.