1. Plugs are easy to change
2. Common mods;
a. Peformance chip from
www.reinhartautomotive.com
b. RichardM tube (replaces the violin case) look over at
www.tccoa.com
c. Remove the air silencer
d. exhaust system mods usually involve Dynomax, Flomaster, Borla or Art Carr
Or, you could just get a 2002 Ford Explorer engine, which is an all aluminum version of the Mustang GT motor. Has to be a 2002 model.