{"id":1003,"date":"2026-08-06T12:45:46","date_gmt":"2026-08-06T12:45:46","guid":{"rendered":"https:\/\/thetorquefactory.com\/?post_type=product&p=1003"},"modified":"2026-08-06T12:45:46","modified_gmt":"2026-08-06T12:45:46","slug":"fms-motorsport-om605-manifold-flange","status":"publish","type":"product","link":"https:\/\/thetorquefactory.com\/index.php\/product\/fms-motorsport-om605-manifold-flange\/","title":{"rendered":"FMS Motorsport OM605 Manifold Flange"},"content":{"rendered":"

FMS Motorsport OM605 Manifold Flange. This is the CNC-machined billet head flange used in our OM605 turbo manifold kit, sold separately for builders fabricating their own manifold or replacing a damaged one. Designed in-house and machined from a solid billet of stainless steel \u2014 not a cast manifold, where casting is a built-in compromise between quality, performance, and price.<\/p>\n

Built for Reliability Under Load, Not Just Peak Numbers<\/strong><\/p>\n

In motorsport, a part rarely fails the first time it’s asked to work hard \u2014 it fails after hundreds of heat cycles, once a weak point has had time to show itself. A restrictive port transition doesn’t just cost you a bit of spool on the dyno once; it means the head runs hotter every single pull, every track session, every time the car is driven hard. Over a season, that’s the difference between a setup that holds up and one that starts giving you problems right when you can least afford them. Getting the transition right isn’t a nice-to-have \u2014 it’s part of what keeps the rest of the engine out of trouble.<\/p>\n

Why It’s 25mm Thick<\/strong><\/p>\n

The OM605’s exhaust ports are low and wide. Machining a clean, gradual transition from that shape into round tubing takes real material thickness to work with \u2014 not a stamped or thin-cut plate. That’s the actual reason for the 25mm, not thickness for its own sake.<\/p>\n

Machined From Solid Billet<\/strong><\/p>\n

CAD-designed in-house, then CNC-machined from a single block of stainless steel. That’s what makes it possible to hold the exact transition geometry we designed, rather than whatever a casting mold happens to allow.<\/p>\n

Fitment<\/strong><\/p>\n

Port spacing is identical across OM604, OM605, and OM606 \u2014 same pitch, just repeated for however many cylinders each engine has. The OM605 is a 5-cylinder head, one port longer than the OM604 and one shorter than the OM606, so this flange is machined to that specific length and port count. It is not interchangeable<\/strong> with the OM604 or OM606 versions \u2014 order the OM605-specific flange for this engine.<\/p>\n

Build Your Own Manifold<\/strong><\/p>\n

Sold separately from the turbine end, so you can pair it with whatever turbine flange your build needs. Also the correct replacement part if you already run our OM605 kit.<\/p>\n

Specifications<\/strong><\/p>\n