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I have a 2016 z06 that didn't come with side skirts and put some 3/4 length ones on yesterday. It took 30 minutes total for both sides installed with rivets.
And to your other question.... the skirts were an option until 2017 when the 3/4 length ones became standard equipment to mostly help with rocks getting thrown in front of the rear wheels on the widebody cars and thrashing the paint on the brake scoops.
I installed oem side skirts and a splitter on my Stingray. It was a piece of cake. Check out fleabay, there are several oem sets available for about $400.
My '16 Z06 came with a splitter (no skirts), but the splitter was slightly damaged when I purchased the car. I replaced the splitter and added side skirts. Very easy install. There are a number of how-to videos out there. Take a look at them and they will give you a very good idea of what to expect. I didn't have a lift at the time (I now have a QuickJack lift) so I just drove the car up on boards and was fine. Some use rivets, some use self tapping screws. Basically you're going to do a little drilling into your underside body work. It sounds terrible, and will probably feel questionable at the time you do it, but it's how they get installed, and it's on the bottom side, so out of sight anyway. The end result once the splitter and skirts are on will make you forget all about those holes you drilled. They make some nice black "split" rivets. I bought a bunch online and used partial rivets and partial self tapping screws for mine. The rivets look/work like this:
The only caveat is to be careful with the drilling depth if you have an automatic trans as there are coolant lines under the drivers side rocker. Of course you should be careful no matter where you are drilling.. Use a drill stop and keep the depth as shallow as possible on both sides. I also slightly pulled the rocker down and slid a thin piece of sheet metal under the rocker while drilling to be double sure of no damage to the lines on my car.
The only caveat is to be careful with the drilling depth if you have an automatic trans as there are coolant lines under the drivers side rocker. Of course you should be careful no matter where you are drilling.. Use a drill stop and keep the depth as shallow as possible on both sides. I also slightly pulled the rocker down and slid a thin piece of sheet metal under the rocker while drilling to be double sure of no damage to the lines on my car.
Another caution is to take your time and make sure the front edges of the skirts align with the back of the front wheel wells before drilling holes. Most skirts come with a hole in the forward end that uses an existing panel bolt for mounting and alignment before drilling holes. On my car I did the drivers side first and the leading edge of the skirt aligned with the bolt and hole perfectly. The rest of the mounting and drilling went fine which stoked my confidence. On the passenger side I followed the same procedure but did not look closely at the forward position until I had drilled all the holes. Then comparing the sides I saw a 3/8" difference and a gap in the forward alignment of the passenger skirt. The reason was the bolt position on the passenger side was set back 3/8" during assembly of the car at the factory. So after kicking myself in the *** for about an hour I took the skirt off and slotted the front "alignment " hole so I could closely align the edges. After that I decided to transfer the location of the holes I had already drilled into the car onto the side skirt which was tedious, and after drilling new holes in the skirt was not nearly as accurate as I would have liked. But in the end with some patience and a round jewelers file I was able to get the new holes close enough to secure the skirts. My mistake is now hidden under the car. Good Luck and check YouTube for "how to " videos.
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Easy to install - I put a set on my ‘14 Stingray. Helps to have a couple of other people to assist with the placement of the side skirts before drilling/riveting.
My '16 Z06 came with a splitter (no skirts), but the splitter was slightly damaged when I purchased the car. I replaced the splitter and added side skirts. Very easy install. There are a number of how-to videos out there. Take a look at them and they will give you a very good idea of what to expect. I didn't have a lift at the time (I now have a QuickJack lift) so I just drove the car up on boards and was fine. Some use rivets, some use self tapping screws. Basically you're going to do a little drilling into your underside body work. It sounds terrible, and will probably feel questionable at the time you do it, but it's how they get installed, and it's on the bottom side, so out of sight anyway. The end result once the splitter and skirts are on will make you forget all about those holes you drilled. They make some nice black "split" rivets. I bought a bunch online and used partial rivets and partial self tapping screws for mine. The rivets look/work like this:
Also known as Exploding Rivets. I use the 3/16 ones with the large Vs the small head.
They grip well.
I went with Apsis (pricey, but on sale at the time), mainly because they had a full carbon flash set, including the extra-wide fender flares, available immediately. The wide flares along with the skirts are good for keeping stones away from the sides.
There is a good chance that z06 without skirts has some serious paint chipping unless Protective film was installed?
Gonna need mud guards also to keep the chipping down.
I'll just throw this out there but instead of drilling I used my soldering iron and melted the holes to add a front splitter. It was the same diameter of the rivets. You just have to be careful not to get the hole too big. Once it starts melting, it goes quickly. Then you have to clean the iron afterwards.