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GT28R or Sp530 for your goal for pump fuel. You may need to consider a used set, probably of the GT28R turbos, from someone who decided they wanted more power and get used downpipes (5-bolt). There may be a set of GT2530s coming on the market in that price range as well, as they would be a good choice also. You will not make 450rwhp on pump fuel with Sp500s (safely). SS
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