That is a lot of boost for such a small turbo/engine...

This might be slightly offtopic since you're taking about the TSI, but I'm curious about the maximum boost pressure in the 66TDI but I've had no luck finding it anywhere. Wiki doesn't have it and I've read the polo brochure over many times, does anyone happen to know? I've bought myself a mechanical boost gauge and all the required fittings for a tdi but as it turns out, to get the intercooler-intake pipe out to tap into you'd likely have to take off the front of the car. There's one sneaky little bolt that's incredibly hard to get to.

More effort than it's worth just for curiosity's sake at the moment, maybe at least until the warranty has expired and tinkering can begin