I am curious to know what performance upgrades would be best to go after on a 2017 subaru legacy?
Buy a WRX.
K&N air filter, or other aftermarket high flow air filter. Less weight is your friend...lighter rims/aftermarket wheels lighter than stock steel rims.
Looking for a Used Legacy in your area?
CarGurus has 15,855 nationwide Legacy listings starting at $1,999.
Search Subaru Legacy Questions
Subaru Legacy Experts