Designed to quite a few different BMW applications using MAF part # 13627804150 , but we used them for N57 with customs cold air intakes, or for custom compound setups. Made from 6061 Aluminum and has a 4" radius, but will fit and weld very well to pipe ranging from 3"- 4.5" OD.
Includes stainless steel allen head screws (not pictured).
