My experience with D3 Cadillac turned out to be dreadful. In the end I was provided nothing. What I did get was the run-around about their dyno performance tuning a what they could offer me. The way they handled the problems that arose with the work they performed and their attitude toward me as a customer was appalling! Their work is under par and capped off by delays and fabrications to put me off as long as they could. My encounters with the entire one-on-one poor customer service from the staff at D3 is a highly suspicious business practice and lack of integrity or to offer performance-oriented modifications they promise. My recommendation is to steer clear of D3 Cadillac for any modifications to your Cadillac. It took nearly three months for me to get my $895.00 back with many frustrating phone calls and hardly any response by D3.