Build up the car as you like, its your blank canvas not your mates, who cares what the dealer thinks about a modded car chances are you wont take it there anyway.
It is unlikely that you will trade it in when it comes time to sell, as the dealer will offer a pittance and to be honest they don't want any old BMW pre 2010 on there yard chances are it will end up at auction. Dealers only want to sell new cars much less hassle. The down side is you spend your $100,000 for your dream car to find out that next year there is something better. You are screwed cause now your car is worth $65,000 as a trade in.
The new up and coming owners of these turbo BMW 135/335 come from a performance back ground anyway, so you may find that a tastefully modded car is what the new market will be looking for.
I can tell you that a lot of our new customers come from the JDM car seen and would sooner purchase a nicely done modded car than a stocker.
If you own a N54/55 car Why would you not aspire to mod it
if you want to leave it stock and have a few bucks you purchased the wrong car.
So if you want to mod it just do it, hang onto all the old parts and have a ball
