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Congrats on a sweet ride.
I have a new to me 07 mt X3 also and love the car.
Change the transfer case fluid regularly.
Buy a gear for the transfer case actuator motor so you can change that when it goes.
Check for usual oil leaks (valve cover and oil filter housing gasket).
Check driveshaft flex joints are tight.
There’s pretty decent documented fixes most
Of the common issues on forums and YouTube.
Starters seem to go also.
Not much performance mods I’ve heard
Of for these but I would stay away from too much mods to try and keep transfer case alive as long as possible.
All the best with the new ride!
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