The RBC intake manifold has been dyno proven to make superior power to the PRB manifold. It is an excellent bang-for-buck upgrade for anyone looking to get more power from their K20. If you wish to upgrade to the RBC while retaining your drive-by-cable throttle body, you will need an adapter. 

Blox Racing offers a solution - a bolt-on adapter that will allow you to keep your PRB throttle body. Available in 62.5mm for stock bore, or 70mm for use with an aftermarket throttle body (such as the 70mm Blox Billet Throttle Body for K-series). Each adapter is CNC machined from aluminum to ensure a perfect fit and leak-free operation.

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