Our 2001-06 BMW E46 M3 Section 1 Rasp Eliminator Pipe is made from the same mandrel bent Polished T-304 Stainless Steel with CNC Machined Flanges like all of our Exhaust products and feature our Limited Lifetime Warranty does not include resonators, bungs, tabs, or brackets. Its called a “Rasp Pipe” As It will help remove the Raspy tone the S54 Motor is notorious for with the Stock Section 1 equipped .ID of piping is 60mm or 2.36″. Available with or without 02 Bungs/EGT. Made in the USA MADE TO ORDER: *Please note these are made to order and build time takes about 5-6 weeks after placing order.*