Manifold in stainless steel for Suzuki GS 500/F 89-09, with visible parts polished tubes are manufactured in austenitic stainless steel 304, that offers a truly exceptional resistance to corrosion with respect to that in the ferritic stainless steel. The visible parts are polished. The primary section of the exhaust is manufactured with stainless steel tubes 30 mm high quality 1.5 mm. There is no required replacing or rimappaggio after installation, however we always recommend a dynamic test after installing spare parts to your bike.