PORTED Manifold ONLY!!
No fuel rails no injectors no throttle body!
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
