Like the title says, this is a stainless steel BillyBoat exhaust system that includes center pipes, Mufflers, 4" polished exhaust tips, and everything in-between. The exhaust system was only test fitted to make sure fitment was good, and then taken off. It sounds great! And you can really tell a difference in how much faster the turbos spool up and keep boosting! The price is $800 plus shipping which is a killer deal. PM me for pictures. This fits the e92 335i n54 engine. I'm sorry, there are no downpipes in this kit, i confused it with another, and can no longer change the title.