[Christ]

I haven't with this motor, I did with an older Cavalier Z24 engine (non-stock 2.8 hybrid) but we were using a butt dyno and just adding tubing to see where we could get a decent bump.

IIRC, we ended up using that 17 inches of piping, which, given the limited space, ended up being more restrictive at mid-high RPM b/c of the number of complex curves that were necessary.

I haven't looked into it any further, we only did that as an experiment for a school report when I was in 7th Grade.

I've thought about a few ways to make an intake manifold that will constantly adjust it's runner length based on RPM, but nothing has come to fruition yet. I believe that technology is something better served for use with engines that have truly variable valve trains, run by solenoids and a computer, with no cam. Said engines will probably also have variable compression and stroke characteristics... and it won't be me that invents them. I'm not that smart.