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I'm looking to upgrade my stock exhaust on my 2016 WRX STi as I want more of that typical boxer rumble, the stock is decent but I think Subaru have notched the sound down a little 

Any recommendations fellas ? I want to keep the same exit styles as I really like the quad pipe finish 

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Try fitting unequal length headers first that should give you the lumpy idle etc, failing that try a prodrive back box, had one on my hatch as a dealer PPP upgrade (pre 330s) quad pipe but not too much increase in volume

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