Applicationt: 
audi (A6L, A4L, A4, A1, A8, A5, R8, Q7, Q5, TT, S6, S4, allroad)
BMW (3 Series, 5 Series, 1 Series, 6 Series, 7 Series, X3, X5, Z4)
Citroen (Fukang, Elysee, C2, C4, C5, C6)
Production Description:
This type of filters are mainly made of aluminium and applicable to AUDI, FORD, BMW, BENZ etc, which range 80 varieties. The seaming can use laser or arc welding. The safety valve in this type of filters is very crucial and has been inspected strictly before assembly.