Firstly Welcome.

Secondly, why start with a front mount? This will take you backwards, not forwards in performance, unless some other serious mods are done at the same time. Also by dump valve I assume you mean blow off valve? Your choice but it isn't a performance mod and I have no doubt it will annoy you after a while.

Get a turbo back exhaust and a flash tune before anything else. And money permitting chuck a better turbo on than the TDO4 that's on there now, and a new fuel pump whilst you are at it.

Will transform the car for little cost, and also sound the business

Thicker front and rear sway bars will change the way the car handles to and help counter the typical Wrx under steer. Best bang for buck mod you can do!

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