BPS 5" Stainless Steel Marmon Weld Flange – S400 / S410 Downpipe

Marmon Flange Mastery: Stainless Steel Weld Ring Built for Leak-Free S400/S410 Downpipes Stop fighting exhaust leaks on your custom downpipes. This heavy-duty 5" Stainless Steel Marmon Weld Flange is the go-to choice for serious diesel builders running S400, S410, and many other frame turbos. Precision machined from 304 stainless steel for maximum corrosion resistance and perfect fitment every time. Whether you’re fabbing a custom downpipe, upgrading your exhaust, or replacing a worn factory flange, this weld ring gives you a rock-solid, leak-free connection that holds up under extreme heat and vibration. Available with or without our heavy-duty stainless clamp — choose what fits your build. Perfect for owner-operators and shops who want premium results without the price tag of big-name exhaust brands. Key Features Heavy-Duty 304 Stainless Steel Construction: Superior corrosion resistance and strength for long-term reliability in harsh diesel exhaust environments. Precision Machined Marmon / V-Band Profile: Perfect fit on S400, S410 primary turbos and many other popular frames — ideal for DIY downpipe fabrication. Two Convenient Options: Buy the flange alone or get the complete kit with our heavy-duty stainless steel clamp for a true DIY solution. Easy Weld Installation: Designed for clean, strong welds on 5" exhaust tubing — fabricators love the fit and finish. Leak-Free Performance: Creates a tight, reliable seal that won’t blow out under high pressure or extreme temperatures. Fitment: S400, S410, and many other turbo downpipe applications. Always verify your tubing OD and turbo outlet style before ordering.