BMC makes an oiled air filter for the 718 if you are so inclined to use one. Some people say they are better in quality than K&N. BMC AIR FILTER FB926/20. Porsche, Ferrari, Lamborghini, and Audi R8 Performance Exhaust Systems & Parts
I just installed this today in my 718 cayman - the instructions to get to the engine bay are very similar to this (all the same trim pieces need to come off in the same order, they just look marginally different):
Small trim tool (maybe not needed, but it helped on the pieces by the seatbelts)
T30 bit (4 screws on metal cross bar, 10 or 12 screws on engine cover)
T25 bit (4 screws on airbox)
Pliers (if you don't have a T30 allen key you can use pliers to turn a T30 bit. Though, you're likely to lose your bit somewhere in the interior doing this)
Screwdriver (for the 2 bits)
T30 allen key (2 bolts are in a position that makes them impossible to get with a screwdriver, you need a lowprofile ratchet that can hold your T30 bit, or an allen key)
- The video does not show this as that is a 981.1, but on the 718 (981.2) there is metal in the way of 2 of the bolts for the engine cover - this is why you need the allen key.
- Trim pieces were relatively easy to take off - watch for the small plastic "cone" looking things - those go on the ends of the trim connectors.
- The metal cross bar is easy to take off, and much harder to put on - it bends a little so I would recommend not fully tightening all 4 bolts until you have them all threaded (might make it easier). This required me using a ratchet with a T30 bit just so I could tighten, I didn't have enough torque with a screwdriver.
- I found it more comfortable to stand / squat in the rear "trunk" area to screw/unscrew the engine lid