2006 outback 2.5L tapping noise at 2500 to 3500 rpm

I would need to hear first hand.

The tapping is the valves hitting against the buyer upper part of engine. The stalling is most likely the computer shutting down engine. You might have engine damage. The tapping comes and goes according to engine rpm the higher the rpm the louder the tapping. If I was have it towed to u mechanic and have them run test engine might be beyond repair

On this website you find fuse box diagram and description for Subaru Outback

2005
SubaruOutback 2005 fuse box diagram Auto Genius

2006
SubaruOutback 2006 fuse box diagram Auto Genius

to possible answers
the axles are new and the cv joints mat be firm resulting in noise transmission through failing engine mounts ( unlikely but possible )
the tread pattern may be the cause of the noise especially if the tyre pressure is incorrect
Take it back to the shop and take them for a road test to see if they can find the reason
when drive axles have to replaced , it generally means that the front lower arms have to be disconnected so a wheel alignment may also be in order

try skimming your rotors

Its you backing plate/....there is tsb on this.....

540 ohm

heavier oil if you are not in a cold climate. but before you do that have the oil pressure checked. We used to use a can of STP every once in a while on a motor in a dodge we had... nothing wrong with it... was just noisy.

Robert

I would change the diff fluid as soon as possible.