One (1) 409 Stainless Steel Resonator Pipe Free Exhaust Gaskets-----Northeastern Exhaust Features:Horsepower gains with our non wrinkled pipes for better, non restrictive exhaust flow. 409 stainless steel for longer durability compared to regular aluminized steel exhaust systems.China AISI 409 409L Stainless Steel Tube for Car Exhaust AISI 409 409L Stainless Steel Tube for Car Exhaust. Get Latest Price. Min. Order / Reference FOB Price. 1 Ton. US $39/ Ton. Port:Tianjin, China. Production Capacity:5000tpm.