We struggled with getting to the inside lower nuts onnthe OEM RB26 exhaust manifold, so we decided to make a custom wrench.
The RB26 exhaust manifold wrench is designed to ease your struggles with OEM exhaust manifolds. Its double-ended ratcheting feature allows you to access those tricky inside nuts effortlessly, even with the cam cover in place.
Update:
The wrench will work with Tomei manifolds.