i'm sure there's a ton of questions like this already, but i've been searching and can't seem to find much. I recently got my hands on a 1999 a4 2.8l quattro for free, and the motor is a bit different than what i'm used to. i guess my question is what is everything that CAN be done to it performance-wise? is there much else that can be done besides turbo/supercharger, stasis chip, exhaust systems, and air intake?(while still being practical for daily use) engine seems really crowded as is. not sure how much modding i will actually be able to do, but i'd really like to know all the options that are out there. any help would be appreciated haha also what are all the potential engine swaps out there?? thanks for looking