nice post!, can you recommend a compression tester that's pretty good and accurate? thanks.
I bought this one back in 2013
https://www.amazon.com/gp/product/B000R5CPAQ/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
Has worked well on my previous cars. Haven't used it on the GTI yet, but should work just as well.
The one 2slowvw posted looks nearly identical for a lot less money!