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‘03 3.0R LL Bean Outback + ‘14 Forester Premium
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Congrats on your 3.6L with the 5 speed Auto! I’d recommend replacing the spark plugs and all the fluids and air filter to establish a baseline. Running 89 octane gas instead of 87 octane regular may improve performance also due to the timing possibly being retarded to prevent detonation.

We have a Gen II 3.0R with 4-speed auto that we have owned since new. I had been having the trans fluid and diff oil replaced on the severe schedule every 15k miles. Then after 125k got lax and didn’t have them changed for 40k. Just had them changed and the 1-2 shift became noticeably smoother.

If you can do your own oil change and can send in a sample for oil analysis that can be very illuminating on how well the car has been maintained.
 
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