A t-28 will not be happy at 300rwhp. not even at 280rwhp.
A t-28 from an oem sr20det is happy around 245rwhp. anything more than that is asking for trouble, excessive wear and tear.
if you want a reliable 300 from an sr20det then you need to upgrade to an aftermarket garret turbocharger, such as GT28RS.
camshafts would be a worthwhile investment, they will allow you to use less boost to make the same amount of power. No reason to go big with the camshafts; some S3's are perfect.
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