Description: PORTED Manifold ONLY!! New OEM PORTED NNBS/TBSS Cathedral Intake Manifold Silverado Sierra 4.8 5.3. This ported manifold is a direct swap for any 2007-2008 GM silverado sierra with the 4.8/5.3 engine, no tuning required but optimal for best gains. This ported NNBS manifold is also the one you need if looking to do the NNBS/TBSS manifold upgrade on your 99-06 GM truck. Fits any cathedral head. 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: 575.99 USD
Location: Mesquite, Texas
End Time: 2024-09-17T16:11:44.000Z
Shipping Cost: 0 USD
Product Images
Item Specifics
Returns Accepted: ReturnsNotAccepted
Brand: General Motors
Other Part Number: 25383922 , 12597598 , 12580420
Type: lower
Interchange Part Number: 4.8L intake manifold , 5.3L intake manifold
Fitment Type: Direct Replacement
Manufacturer Part Number: 12580420
Features: Bare
Material: Plastic
Surface Finish: New
Superseded Part Number: 25383922,, 12638038, 25379709
Country/Region of Manufacture: Canada
