Ran between 15-18psi on mine (mostly 16-18 over the last 3 years hahaha) for about 4 years and built up an insane amount of kms over that time, commuting, road tripping, driving like a dork, letting others drive like dorks, drag racing, a few laps of the track and the last time it hit the dyno it made it's highest ever number on that particular dyno - the last compression test was at around 170-180,000km from memory (GT3076R when on it at around 100,000km) was within 10psi across all 6. If the tuning has been and will be good and there have been no other issues (ie, triggering issues) which might cause detonation or whatever then it should be fine.