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NBS came in 99-07 trucks, looked different, narrower, fuel rails were different and black, and they used 3 bolt throttle bodys.
This is either a NNBS or TBSS, which are almost identical to each other and as pictured, use those silver fuel rails, and use a 4 bolt throttle body. GMs best cathedral intake, even better than LS6. A buddy just installed one in a 4th Gen Camaro, but it required removing passenger wiper. Good budget upgrade over Ls6 when you don't want to spend on a Fast. Less expensive than Ls6 also.
That is a 2009+ NNBS intake by looking at the MAP hold down and the PCV nipple. The TrailBlazer SS was in production from 2006 through 2008 (2009 had only 610 TBSS production numbers). The 2006-2008 TBSS and 2007-2008 NNBS intakes MAP sensor has a clip type hold down and a large nipple for the PCV hose connection.
The 2009+ NNBS has a different MAP hold down and a smaller PCV nipple. The 2009+ NNBS uses a different MAP sensor and the newer sensor will not work in a Gen 3 vehicle without scaling the sensor in the tune. Most people just use the GEN 3 MAP sensor in the GEN 4 NNBS intake with swapping to a different o-ring with a dab of RTV. Simply using a GEN 3 to GEN 4 MAP harness adapter using the GEN 4 MAP sensor will not work without scaling the tune in a GEN 3 vehicle.
This is the 2006-2008 TBSS intake (12580420) that shows the larger PCV nipple. You can't see the MAP area well as my homemade MAP hold down bracket is in the way. I refused to pay $30 for that little darned hold down clip.
Definitely wrong I mixed up the styles in my head. The look different and I thought I had remember the NNBS intake being all liney and **** and the NBS being the lumpy
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BTSS or NBS specs??? 
