I just got a 99.5 1.8Quattro and wanted to do some performance work to it. It has about 100k miles on it so i didnt want to go crazy with upgrades although the car is in amazing condition. What would be a good place to start with performance upgrades?

 

you found the correct section to post in, but not this?

https://www.audiforums.com/m_700266/tm.htm

this will tell you everything you would want to know