This is the reality and must do for any gear box with Porsche Syncros. They MUST have some time to sync before trying to engage the alternate gear. If not the Porsche syncro will be destroyed in short time. Read the story below, all applies to the exxe gear box.
http://blog.dietersmotorsports.com/?page_id=231
"Sometimes the problem is not a loaned car at all, but a car being driven by a misinformed owner. I had a friend of a friend bring a 993S in for me to look at because he said it made a bad grinding noise. He said the noise happened when he shifted the car from first to second and from second to third. After a very thorough test drive I could find no shifting problems with the car. As a matter of fact, this 32,000 mile 993S was like a new car in every way. So when he came to pick up the car we went for a test drive together with him at the wheel. After the first run through the gears it became apparent what the problem with the transmission was. The driver was shifting the car so fast that the synchros could not possibly do the job they were being asked to do. “How fast?” you ask. So fast that his hand started two inches below the shifter in second gear and got a running start towards the knob in making the 2-3 shift … (I know … almost brings a tear to your eye.)
After I screamed “STOP!” we switched seating positions and I showed him the “two finger rule”—how the car should be shifted using no more effort than can be applied with two fingers on the shift knob. It shifted perfectly without grinding or any other issues. This was his first Porsche and he had been told by a “friend” who knows all about Porsches (but had never actually owned one) that this was how a Porsche was meant to be shifted. I explained how a synchro works and he then understood the “what and whys” of the two finger rule. Now for a bit of what I told him.
“Synchro” is short for synchronizer. The official definition is “to cause to go on, move, operate, work, etc., at the same rate and exactly together”. That is precisely what it does. It makes gears spinning at different speeds match their rotation so they can smoothly engage. It does this with what looks like “Dog teeth” or engagement teeth. These are rings of pointy teeth that engage the gear to the shaft (like intertwining fingers as you bring your hands together). When gears grind, it is these dog teeth coming together, but not at the same speed. The sliders are, well, sliders that move along the input/output shafts. They engage power from the gear to the appropriate shaft."
Bernice