BMW E24/E28 M30 extractors/headers. They're made from high-quality steel and sold with a 12-month warranty. Ports are matched to standard M30B35 head. Piping from the flange to the collector is 1.5 inch and 2 in from the collector.
 
No fabrication to extractors needed, direct factory fit RIGHT-HAND DRIVE, beware of poor quality copies.