How much power can you add to the quartos with 2t's before reliability suffers?
What gives out first?

Lee

 

Check the stickies at the top of the forum. It's all covered there including what to replace before you start tacking on HPs.

https://www.audiforums.com/forum/b7-...sticky-144534/

As with any car, the $/HP goes way up the more you add, but the first few steps are pretty reasonably priced.