Im having my old engine removed and put into another A4, since im doing all this work, I would like to spend about 150 dollars fixing things here and there. I hear snub mounts would improve the vibrations of the car and it only cost 20 bucks. so if there is anything else i can improve on for the car let me know here.

98 A4 2.8Q
K&N air filter
Catback Magnaflow exahust
ADR wheels