We now stock the new bolt on Overkill 80mm TB kit. The adapter plate is designed with a tapered bore, kind of like a velocity stack, 80mm opening at the front where the throttle body bolts on, and it tapers to 72mm of the stock intake manifold opening. This new setup will work with a stock intake manifold or a JacFab filled and ported intake manifold.
Quote from the Overkill website:
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Our 80mm throttle body solution is now available as a stand alone bolt on option for the LGX motor! The factory throttle body is 72mm minus the throttle body shaft diameter, making it quite small for a modern 300+ horsepower motor. This 80mm throttle body dwarfs the factory unit to allow more airflow without restriction. We're seen up to 11 wheel horsepower gain on other GM 3.6 motors and expect very noticable performance gains on the newest 3.6.
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You will need an aftermarket cold air intake to use this 80mm throttle body because as of right now, there is no way to connect the stock air tube/box to the larger 80mm throttle body.
K&N and AFE users will need a 3.5" to 3.25" straight reducing coupler to connect the air tube to the 80mm throttle body. GMPP intake users will need a 3.5" to 3.0" reducing coupler. Have not worked out a solution for the new CAI Inc cold air intake yet as its still too new.
Along with the TB kit, as of Monday we will be offering a coupler and clamps as an optional purchase to go along with the throttle body kit that will suit the K&N, and AFE intakes. We will not be stocking a coupler for the GMPP intake, and probably not the CAI Inc intake.
If you buy the Overkill 80mm ported manifold, the 80mm adapter plate is permanently attached and is irreversible, which may make it difficult for states with stringent visual smog inspection as you will not be able to put the stock airbox/tube on, nor the stock throttle body with this manifold. We (JacFab) are not a fan of this approach of permanently modifying the intake manifold so that you can't go back to, or use stock parts if you choose to, or need to for smog inspection. The JacFab manifold has a stock size throttle body inlet, which you can use the stock or VMAX throttle body, or the new bolt on Overkill 80mm TB kit with the tapered bore adapter.
If you have any questions, feel free to ask.