Excellent product - install should involve two more steps though
Overall, I am very happy with this intake and would recommend it to anyone looking for more performance and a sportier sound from their GM 5.3 V8. Throttle tip-in response is much faster, revs build instantly, and the sound is very deep and throaty. I do not understand why a few people have said that the intake is too loud; if this is too much sound for you, the stock setup must also be somewhat unpleasant and frankly you should not be in the market for powertrain performance upgrades. Also, when you are not on the throttle, engine noise is non-existent inside the cabin. This is true both at idle (cold or hot - if you remote start the engine with your ear to the hood, you cannot tell the difference between this intake and the stock setup) and anywhere higher in the rev range - just lift off of the throttle and the sound just instantly goes away. That said, two steps (that involve minor modifications to stock parts, not Corsa parts) are, in my opinion, needed. I added pictures to illustrate.
Photo one shows the full system installed, and you will notice that there is a hose clamp in the middle of the rigid tube from the airbox to the throttle body. As you can see in photo two, this is to hold the hose retaining clip from the stock intake in place on the tube to prevent unnecessary friction wear. To do this, you simply re-use the hose clamp from the stock intake tube to the throttle body, and you remove the plastic bracket that holds the stock plastic hose clip to the stock intake tube. You can drill out the stock plastic rivet that holds this part to the intake tube, or you can crack it off with a prybar or slotted screwdriver (I did the latter). The factory hose clamp has notches in it that align it to the intake tube during installation; in this application, one of the notches seats into the factory plastic hose bracket to hold it in place. This step is not strictly necessary, but is advisable to keep the hoses from flopping around loose in the engine bay and requires only five minutes of time and reuses parts from the stock system, so you don't need to buy anything else.
Second, and shown in picture three, there is a simple modification you can make to the stock plastic breather tube that makes the use of the Corsa braided hose much simpler and neater. Instead of fastening the Corsa hose to the stock end of the breather tube, cut the breather tube down so that only 1-1.5" of tube remain, with the opening facing the radiator. Then, slip one end of the Corsa hose onto the Corsa intake tube, and the other end of the hose onto the cut-down stock breather tube. No fasteners are necessary, excess tubing is removed for a smoother fit, and the hose is held in place both by the diamter of the hose itself and by the S-curve shape the Corsa hose must be bent into in order to fit this way (which looks much cleaner and more intentional as well).
Yes, I know that the hose clamp on the Corsa intake tube doesn't look as clean as the setup does with this step omitted, but if you aren't planning to take your vehicle to a show, it's a smart move for durability's sake.
This was all done on a 2011 Chevy Suburban LTZ with the 5.3 V8. And was totally worth it. Took me about 45 minutes end to end including the time I took to engineer these two additional steps.
