titanium exhaust pipe 1.material:Gr1,Gr2,Gr3,Gr4,Gr5, GR7 GR9 GR11 GR12 etc 2.standard:ASTM B/ASME SB861,337 and ... ,Gr4,Gr5, GR7 GR9 GR11 GR12 etc 2.standard:ASTM B/ASME SB861,337 and 3383.specification:outer diameter:.4-130mm ... inquiries!Tel:86-10-89243065Fax:86-10-89243047 titanium exhaust pipe