For now I just did the K&N Air filter, and can honestly say I noticed maybe a 5-10% difference in acceleration. I have no been able to find a full cold air intake system (or other performance mods in general) for the CH-R.Welcome to the forum and congrats on your first Toyota! Excellent choice with the C-HR. Look forward to seeing all of your mods. Are you planning on getting a full aftermarket intake or just the filter swap?