Not sure if it's noticeable, but we're constantly trying to improve our designs and technology. We did left some wiggle room with our very first manifold ever - the m103. Just like the first time with a girl - no finesse was involved at the time. And now that we know what goes where - there you have it - a much more aesthetic twin scroll manifold for your turbski. Rest assured, if you love the m103 torque and early pickup, you'll love having it doubled. Features: - T3 twin scroll turbo flange (we do have t3 to t4 adapters in our shop) - 3 bolt wastegate flange corresponding to a 45mm wastegate surface area. All manifolds will come with a gasket, block flange if an internal wastegate turbo is used and a flange with a hole ready for 50x2 tube/bend to be welded on.