Hmmmm well I'm not sure about longevity but base upon research and feed back it should be safe as long as u don't gun it 5 times everyday, also avoid break boost if its a cvt, I've been running 25psi about 4 months now on my 1.5 cvt, custom tune by the man himself Derek Robinson ?Just curious about the stage 2 21psi tune ,is it safe on non si civic's for longevity?
You actually asked that exact question in a different topic and I answered it in this post.What's the best tune for the 1.5t cvt non si civics?