2005 Mustang GT Body Mods Help or Hurt

:scratchchinI am taking a 25k 2005 Mustang GT and spending about 3k on Body Kit parts and paint. She will look like GT500 when she is done:bigthumbsup. Did I help the value of this car or did I loose some value. Also I had a mint 1995 Mustang Gt with the 5.0. I think I have more punch at least it it sounds better put has anybody raced and old 5.0. I think it might be a race. maybe not. :headscratch: