@Magnified I remember you from the GTO board. Didnt you use the same Avatar?  
I had an 04 M6.  Did the SAP hood, grills and spoiler, Bought Holden CV8Z rims from Australia on the innnerwebs drunk on a black friday special  LOL.    Did a street tune, CAI, mildly ported TB, and Magnaflow exhaust along with all the bushings underneath. Daily drove it for 2-3 years then finally sold it to CARMAX for nothing with 86,000 on it  in 2015 after I bought the HC.  Kid who eventually  bought it found me on instagram and he now has 135+k on it  He added the SAP front and rear bumper,  and did a few other things  Car still looks really good.   Best running car Ive owned prior to the Challengers.  Really enjoyed it.