First Time Toyota owner, and it’s a 2018 CHR!

5-10% is huge! Do you have any numbers to share? like 0-60 or quarter mile times. Fabricating cold air intake is easy but in case of CH-R I was under impression that CVT is the week link. Even if you make more power you will not be able to put it through the transmission to make any noticeable difference. Remapping shift curve might make a great difference. Putting it in sport mode and simulating manual shifts brings out the best performance as far as I could tell. One thing I would advice is to not oversaturate the filter with oil. Over time it will coat the thin wires in your MAF and actually rob power from the engine. I personally have seen 45 HP loss on a LS7 engine over six consecutive dyno pulls from a K&N filter set up. Seventh pull the MAF was cleaned and we regained the lost power.