Lengel plenum + 1/2 spacer to a stock 2 piece lower that was crudely blended to gasket size while on the engine. 60mm Jeep throttle body. I can say, without a doubt in my mind that the head is NOT the cork.

My car has a t04e 50 trim with stage 2 turbine and .63 housing. It always had a pretty bad lag. Like your dragging an anchor. The classic, nothing is happening and then boom, 15psi and it's moving decently. Kind of like a switch.

With the new intake setup, the engine feels free. The power delivery is so much more linear and smooth. It feels like a modern turbocharged engine. I'm running like 8psi and it feels as fast as the old setup at 15psi. So far, zero downsides. Drivability is excellent. Even after eliminating the AIS.