Keith is in middle of building the LEG Technic Porsche and we've just released part one of his epic review, however it's come to light that their is an "issue" regarding the instructions, depending on how you view it; "If you build the model according to the instructions, your model's shift sequence will be 1,3,2,4.. On pages 190 and 192, you will need to switch the 16 tooth and 12 tooth bevel gear as pictured below" LEGO Technic fans reached out to LEGO regarding the said "issue" and this is what they've said: "Thank you to all our dedicated fans for the comments regarding the GT3 RS by LEGO Technic. It is correct that the gears in this model are not sequential as in the real Porsche PDK. This is however, a deliberate decision taken to ensure that we make the best possible LEGO version of this amazing car that both meets our design requirements and gives everyone a great building and product experience. It was a considered decision taken during development that the gears running in the correct order meant that it did not result in a great experience when driving the car. Too many gears are engaged at the same time and smooth running with all those tolerances is just not possible. If you switch the build in steps 267 and 269 the gears will run sequentially, and everyone who feels that this is the better solution should feel encouraged to do so. LEGO Technic really is the ultimate open source design product and now that it is finally available, we look forward to seeing all the 'improved' models our fans create. After all, that is what LEGO building is all about. We hope everyone will have a great building experience and feel a strong sense of pride from creating both our version and their very own LEGO Technic representation of a Porsche GT3 RS. We are very fortunate to have such skilled and dedicated fans that can spot this small deviation from reality and would like to thank everyone for sharing their ideas and expert knowledge."