I had to replace a cv boot on the Passat. The boot stretching tool that ECS Tuning sells looked like the best thing since sliced cheese so I purchased one. Well it would not stretch my boot enough to do the job. It did stretch the small end of the boot past its elastic limit so it is sloppy on the shaft. I cranked the compressor up till the air hose looked like a recently fed python, it still never stretched the boot enough. I called ECS tuning and was informed that there is no special boot to use with the tool, it should work with any boot. So I ended up replacing the boot the hard way.