The TiAL F41 Wastegate bridges the gap between the 38mm and 44mm units. It has a unique 4 bolt design that is backwards compatible with the old TiAL F40 wastegate. This is the perfect wastegate for those that need a bit better diaphragm to valve ratio over the 44mm. The F41 is no longer in production, after the current stock is depleted no more will be made.
Included with every Tial F41: