Yes, switching out your wheels/tires for aftermarket ones can cut up to 80lbs of weight. Other ones is taking out the backseat and replacing it w/ carpet, you could remove sound deadener material but that'* more for the track. Changing out your intake/exhaust helps in weight managment since a newer intake is lighter and takes up less space than the stock one. Changing the exhaust also helps get rid of that huge stock muffler. Removing speakers out of the car of using aftermarket speakers that are lighter can help, and not having sound equipment like amps, caps, subs and such help a ton. Just try not to add extra weight to the car and focus on more power and later when you max out the N/A out of your engine, then move on to weight saving mods.
ADTR 1999 Black Bonneville SE
2003.5 Yellow Mazdaspeed Protege
2003 Azure Blue Mach 1 Mustang