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stock camshaft OEM internals will make 320rwhp around 17.875psi of boost from a 2871r turbocharger and 350-380 on the same turbo with a slight camshaft upgrade (very likely you wind up around 365rwhp on a dynojet) use the smaller 64 A/R hot-side for this turbo. If you want a larger turbo get a larger turbo but know that pump gas 93 octane and 18psi of boost this turbo is favorably matched to an OEM internals engine and having a larger turbo will not change that (it wont make much more if any more power on a larger turbo at the same boost pressure and you will likely loose response/spool) that is why the 2871 is so successfully mated to the sr20det.
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