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It can add power if tuned for but the main thing is a bit cooler IAT and it takes longer to heat soak...
 

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STI OE TMIC would be a mild upgrade, but nothing too significant.

A good aftermarket TMIC, on the other hand, will cool the air better, which allows you to tune the car more aggressively, while maintaining a comparable safety margin. It will also have a lower pressure drop, which will help spool the turbo faster, offer better response, and not make the turbo work as hard to achieve the targeted pressure.
 

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mainly if you up-grade your turbo you need a bigger inter-cooler to support it. most people run front mounts when they upgrade though. Also EJ257 is right, other mods are more important before you take that route though.
 
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