Description: PORTED Manifold ONLY!! Direct replacement for 2009 to 2013 GM V8 4.8L 5.3L trucks/suvs New OEM PORTED NNBS/TBSS Cathedral Intake Manifold Silverado Sierra 4.8 5.3. This ported manifold is a direct swap for any 2009-2013 GM silverado sierra with the 4.8/5.3 engine, no tuning required but optimal for best gains. This ported NNBS manifold can also be used if you are looking to do the NNBS/TBSS manifold upgrade on your 99-06 GM truck. Fits any cathedral head. Please note you will need to use a gen 4 MAP Sensor with this manifold or rig up the gen 3 map sensor so it does not leak. I have seen 12-15 rear wheel horsepower gains on 5.3 and15-18rwhp gains on 6.0 cammed engines. Gains vary by engine and depending on engine modifications. Attached are some pics of dynos I have done. First dyno pic is ported TBSS Vs a ported hi ram on a 6.0. TBSS beat the hi ram on the dyno and on the track We have sold and ported HUNDREDS of these with positive results and lots of happy customers. @chuy454 if you want more reviews and posts
Price: 459.95 USD
Location: Mesquite, Texas
End Time: 2025-01-25T18:01:05.000Z
Shipping Cost: 0 USD
Product Images
Item Specifics
Returns Accepted: ReturnsNotAccepted
Brand: General Motors
Type: lower
Interchange Part Number: 4.8L intake manifold , 5.3L intake manifold
Fitment Type: Direct Replacement
Manufacturer Part Number: 12638038
Features: Bare
Material: Plastic
Surface Finish: New
Superseded Part Number: 12638038
Country/Region of Manufacture: Canada
