This is a one piece stainless steel, free-flow performance exhaust sytem. It is a year and half old and in excellent condition with beautiful crome tips. The system was made by a local stainless steel exhaust specialist. It fits onto the catalytic converter of a 1993 3.6 litre M5. I paid $1,100 for the system and I will sell for $500 or best offer. I put the factory system back on the car as I am planning to sell it in the spring.