Pretty much the only place you're going to be able to sell a modded car is on the forums or to a bmw enthusiast.
So KBB to start, but most likely having all the mods (no matter how great they are) won't get you more money.
If someone offer a good price for the car + the mods that's a good deal.
And having the 6mt is definitely a plus.
But in the end you might want to consider parting out the car.
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