1.manufacturer sell 2.retail / wholesale / customize 3.stainless steel 304 4.polished surface 5.backing finish racing exhaust muffler 1)Quality:ISO9001:2000 Quality Control System Certification.2)OEM quality standard guaranteed,smooth surface.3)For straight seams, we use carbon dioxide welding; for some corners and small areas, we still use manual welding.4)Long lasting working life time.5) ...