The idea behind these devices is they create turbulence and, turbulent air does not allow the fuel to pool around the ports. One reason when you polish heads and intake you need to make sure there is still enough turbulence to remove the fuel from the corners on the system. So, with these new plastic intakes being so smooth they will tell you that you need this vortex these things create to pull all the fuel so the engine can use it all giving you more HP and TQ......
But the heads are not polished so you have enough to stop the fuel from pooling.
One side effect of polishing the heads and intake is you will lose TQ more than HP.. But, with this 6 speed and the new 8 speeds the TQ is available so fast its not a big deal...
