German and Mauricio (The Valdez brothers) do build some of the sickest cars in middle TN. The picture of the newer mustang was built by the Valdez brothers but the guy in the background to the right (mexican guys name is Enrique) is the owner of the car. German was also the one that ran off the edge of the cliff in his mustang at Union Hill. They are both absolutely wonderful, extremely kind, very cocky and know their shit. The older car they used to have was Mauricio's and that was a '79 Lancer but they called it the Colt (same thing basically) and that had a Grand National motor stuffed in it (lol I remember throwing ice bags on that car many a time).
As far as tuning, I am unaware of his capabilities. To my knowledge...his old cars, he would take to Georgia and Texas for tuning.