Product info states: "Our headers are designed to bolt directly to your engine and stock or aftermarket exhaust systems."
Although I was told it would hookup to my stock exhaust, it took 13 HOURS of custom modification work to get them to fit on. Obviously I can't speak for the other models this part is offered on, but I can tell you that this was the case with my 1996 328IS
As far as the good news....I'll post up tonight and let you guys know how it sounds.
Umnitza now provides a mechanic to install all parts ordered right in the box! It's their new "Total customer service program" that will eliminate all the haters and keep incompetents from breaking **** and blaming the vendor! When you are all set simply call INS and they will pick him up free of charge.