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Over build your motor for the amount of HP you want.
I built my motor too make close to and hold 450whp relatively reliably. My SR has lasted like 4+ years making 350whp on low boost(16lbs). I have never raised the boost, no need.
I also stay out of boost when I DD it, but it takes major rape on the track. Still strong.
Edit: Besides appropriate supporting mods the most important for reliability is your tune.
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