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I put NPPs on my 2006, Z51 with 6spd manual. According to the ad, those are Bi-Mode mufflers from a Z06. Bi-Modes are only on the Z06 and ZR1 and have 3" over axle pipes. NPPs have 2 1/2" over axle pipes.
In order to put the Bi-Modes on your 2006 you will need a 3" to 2 1/2" reducer to mate to your X-Pipe (or H-Pipe). If you have an automatic, you may have clearance problems
NPPs from a 2008 are a direct fit. 2009 and up, the X-Pipe to over axle pipe has a different bend than the 2005 thru 2008 base models.
You will also need a vacuum source to operate the valves on the mufflers. I ran a vacuum hose form the unused nipple at the back of the intake manifold:
I also installed a vacuum solenoid so that I could open and close the valves at will. Others have installed the Mild to Wild kit.
Exhaust Thoughts.
