I'm new to doing things this way, before I would just go to a shop near my house and order parts from them, it was all 5L Mustangs. I have read dif types of comments regarding FSWERKS, IMO, they're all black and white, nothing in the middle, people really like them and are loyal to them or people just avoid them like the plague. I have contacted them twice regarding, first an intake and second the Cobb Tuner, both times I got the feeling they were very eager and friendly/helpful when they thought I was ready to buy, when they got the sense I wanted to ask questions and do some research to make my choice I felt like they just wanted to move on to the next person. In the end I bought my tuner from Mountune yesterday.