Who cares?...You sound like the guys who gave SLP reviews on this board...the only negative ones were from people who didnt even have them and were mad because they werent with mustangs since 1964...give me a break.
They are great quality(ceramic coated headers, and all pipes are stainless, install of everything but the headers is a breeze), they add more power, and sound great. Every aftermarket company that comes along is going to improve the market no matter how you look at it, because they will force other companies to make cheaper and better products.