Bare TBSS NNBS Intake Manifold - Cathedral Port 4.8 5.3 6.0

This Genuine GM NNBS 07-13 Cathedral Port Intake Manifold is the best performing factory cathedral port intake manifold. With the discontinuation of the TBSS intake manifold, this NNBS manifold is essentially the same intake with minor differences in map sensor mounting and pcv. Throttle body opening can support 87mm-90mm throttle bodies. Notes: For Gen 3 Engines using Gen 3 factory style map sensor will need a map sensor adapter to adapt to the intake manifold. For Gen IV engines 07+ running N/A use Map sensor part number 12711681. For turbo or supercharged applications use GM 3 Bar Map Sensor part number 55567257. Uses PCV Hose part number 12597774 Uses part number 12660709 for fuel rails