You know that gasoline engine rated for XXX HP does not run at XXX HP always. If you boost the engine to XXX HP and do street driving only, it might very well be okay. If you drive it on track frequently, it fails much sooner. So, the answer is "it depends". Every engine is different and when you are pushing design limits and deviating from the standard equipment, those differences are even more important. If you are boosting the engine, you are rolling your dice. Don't believe anybody if they say their engine is fine. If you had asked what supporting mods are important for the reliability of an engine boosted to a specific level, that would be a better discussion. Then, we could discuss the driving conditions, boost level, and corresponding modifications like oil cooler, catch can, radiator, forged pistons and rods, injectors, fuel pump, etc.
Now, if I say my engine is fine for street driving at 7-8 psi boost with a standard JRSC (factory tune), oil cooler and catch can, will you care? I rolled my dice and I am happy with it
