[ender2664]

Originally Posted by glenB

If you need it spelled out, have at it

https://www.holley.com/products/exha.../70301304-RHKR

"Max dyno gains of +8.59 HP & +7.3 LB.FT torque" for $700 + labor and small parts

That's max gains, not average, not mean, but max

Scroll through the pics of this link and compare the factory manifolds to the Holley.

http://www.superchevy.com/how-to/exh...heart-exhaust/


For the gains Vs money, long tubes or don't bother.

Doesn't say it there. You must have posted the wrong link.