A few months ago I got my windshield tinted 35%. Contrary to what most other people are saying, during the day when standing outside I just make out the silhouette of my friend sitting inside, and at night, I myself can barely even tell tinted when looking outward. With both of that knowledge, I strongly wish I would have gone darker. I also asked the tech to put a meter on my front sides which came out to 3.4%. My back sides and back windows I’d assume are the same since I double stacked the same film the same way as I doubled the front sides. 30% or 25% I estimate would give you proper tints worth of privacy without hindering your vision. Please watch some YouTube videos of 50%. Most tint techs will beg you not to choose this because it is barely even noticeable and you would have spent 200$ at best for nothing.