Quite a few people here have started off with just a new exhaust system, boost control solenoid, maybe a fuel pump (can be cheap insurance) and get a tune.
Depending on what top mount you have, it might be an idea to look around at upgrading.

I would say $2k would be a healthy estimate of what would be needed to meet you requirements, or perhaps just over.

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2015 Forester XT Premium
2020 VW Tiguan Allspace
teejay: If I wanted a comeback Id wank in front of a fan