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hi i would suggest checking the amount of oil in the trans by removing the dip stick by the firewall in the centre of the engine bay first if thats low it will cause trans to slip, if thats all good next step would maybe to get trans computer tested
Start with a higher flowing airfilter( a replacement panel one in your factory airbox,as a pod filter will **** hot air and off set any flow gains that it gives) a larger diameter exhuast is next and im unsure of what sensors are in your 08 subaru but theres always away of getting around it. They are the best bang for buck modifications you can do and should net you 7-10kw at the wheels, most things after that can get expensive after that on a N/A motor and the airfilter is easy to do yourself , any exhaust place can take care of your exhaust. help this helps.