Of course, proper head sealing is critical with any engine. We used JE Pistons Pro-Seal MLS Head Gasket, part number HN1024-033. The Pro-Seal gasket is made of 3 layers of polymer-coated stainless, embossed for more sealing around the cylinders and water passages. Importantly there is also an additional stopper layer around each cylinder for extra combustion seal clamping force. This makes a huge difference in sealing reliability with high compression and forced induction engines.
For an Intake Manifold to give better flow with bigger and shorter runners for more high rpm power, and to give our motor a sleeper look, we used the tried and true OEM Honda RBC manifold. The RBC intake manifold was originally found on the Euro Accord Type-R but was also standard on the 2006+ USDM Civic Si. The RBC manifold gives a good bump in top-end power without much loss on the bottom end. To fit on the A2 head, you need to cut the water neck off the front of the manifold and to drill a hole in the intake manifold gasket for water to flow through near the 2nd intake port.
For a throttle body, we opted to use K-Tuned’s 80mm throttle body, part number KTD-TB8. This is much bigger than the stock 62mm throttle.
The throttle body has a dual bolt pattern for PRB and RBC manifolds. It has many features to make it more adaptable for different swaps, such as a highly adjustable throttle drum. All OEM sensors such as the TPS, MAP, EVAP, and IAVC fit right on for an easy install.
To ease the transition from the throttle body to the manifold we used this PRL spacer, part number PRL-HC9-IM-STK. This enable us to port the spacer and intake manifold to have a super smooth transition.