I own a 1996 Firebird with a 3.8L V6- are there any inexpensive performance upgrades for my car?

the best power adders for ANY car are exhaust and intake it helps the car take in and get rid of air also running higher octane is a plus a general rule of thumb is 5hp per every 5 octane points i.e running 92 octane is worth 5 hp more then 87