I can only give a seat of the pants report here, but I believe the turbulator is well worth the effort to make and install. I bought a bag of plastic soda straws and a two inch PVC pipe joint. I followed Diamond Jim's instructions on the dimensions of the straws and used a small tube of clear silicone tub sealer to glue them together. I cut the PVC to be 1/4 inch longer than the straws and beveled the last quarter inch to remove the step down from the straws to the snorkel. The unit is installed in the air box end of the snorkel with beveled end facing the carb. Total cost, less than ten dollars.
I need to state here that I do not have the standard jets or filter. I am running a 150 main and a 55 pilot. The filter is my version of Oldfeller's Nu-form open filter. I am also running an open longshot exhaust.
Now, as to my impressions of the ride difference. The bike seems to accelerate and decelerate smoother. It appears to be stronger through the power band and has more torque. In short...I like it!... a lot!!
If you are interested in building one, just search for post by DJ and Verslagen1.  My thanks to both of you!!!

I would be interested in how many of the rest of you are running a turbulator.

That does it, where did I put my collection of used soda straws?

Just kidding, but I do believe I will be trying this as well. I have some 2in PVC pipe in the garage I believe, I just need the straws.