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your fine, you will get more power because of your exhaust.. and you can also use your SRI - depending on how you have your piping made but they will both work
Having exhaust done will only help on turbo applications... as for the SRI you'll be able to reuse it if it is the RRM SRI and you get the RRM turbo kit.
having a better exhaust does NOT only help turbo applications.
anytime you help an engine breath better whether it is inhaling or exhaling, it frees up horse power.
Didn't say it only helps on turbo's... said it will only help meaning it can do no harm for turbo applications. Better exhaust is better no matter what way you are going... NA/Turbo.