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The Greddy IM will make a difference IF you take advanatge of the ability to run more timing. A standalone is a a requirement with the RB25 otherwise whatever you do is pretty much worthless. With the Greddy IM and a standalone like the PFC or aem EMS you can see 300 WHP with stock boost. But like I said You need a standalone to take advantage of it.
This is first hand knowledge.
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