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2007 Kia Optima LX 2.4L 5 speed manual with the stock airbox sound vs airbox delete and a K&N filter on the end with a piece of cardboard to block some of the heat. it does a decent job.

I've had to replace a radio on three Optimas before. One of them was five years ago and back then there was only one video which was less than helpful. I hope this helps someone. If you aren't ever going to take the bezel out again, leave all eight clips in. It's still not going to come out with only four.

I removed the airbox and added a K&N air filter. The car idles and runs just as smooth as new. Engine is more responsive and makes a bit more noise in the cabin.

Tools needed are just a 10mm and a 3/8 drive. two 10mm engine cover bolts, two more 10 mm engine cover bolts under the cover, one 10mm bolt on each ignition coil. pretty simple job. 142,000