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Currently my 2017 WRX is stage 2 with COBB turbo exhaust and MAP intake & tune. I'm looking to install my Process West Verticooler, TGV & EGR delete soon. Is there anything else I should look at adding before I get a custom tune?
 

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I Drink & I Know Things
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It was recommended to me by a very reputable tuner to get an AOS at that stage. Specifically, look at the IAG AOS Competition series. This requires tuning and is considered a zero-maintenance AOS. This is also on my list of things to get.


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