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This a picture of the PCV tube that goes from the intake manifold to the valley cover on a 2001-2003. The PCV valve is the larger diameter part of the tube.
Below is a picture of the same tube on a 2004. The PCV valve/system is inside under the valley cover so there really isn't a way to take a picture of it.
2001-2003 valley cover and then a 2004 valley cover. Note the differences in the black plastic PCV system below the cover. (These pictures are taken from Improved Racing's website)
A good upgrade for a 2001-2003 car is to upgrade to the 2004 valley cover as it is a better PCV system. And it is about the same price as the 2001-2003 GM PCV valve is $100. The 2004 Valley cover and U-tube is also about $100.
You do have to remove the intake manifold but I like wrenching on my car so this was not a problem for me.
