amp or preamp to extend upper end

I used to date this Russian girl. She told me there were only 3 letters in the Russian alphabet: BMW.

"I'm confident on all models upto 2007. Parts are not overkill and work on any repair is faster than in any Toyota or Honda.
Expensive maintenance prices only for the fact having european luxury car."

Parts are not overkill??? You must be joking. You must live in Germany or somewhere in Europe. Here in the US they are absolutely absurd. A Euro luxury car shouldn't have to be synonymous with frequent electronic failures and absurdly expensive repairs. If European luxury continues to equal frequent expensive maintenance their allure will eventually wane as others close the gap. And this from a big fan of German cars.

I think that there has been a lot of variation over the bast 10-12 years. My wife's 2002 325xi had an ongoing electrical problem but was one sweet driver. Felt like it could rev forever. She traded in on a 2011 328xi that was sluggish and the run flats were hard as rocks. She dumped it for a 2015 A3 that is one sweet car w low end pull like a V8. I just bought a 2014 X-1 that is pretty darn nice. Of course they are expensive to maintain but the new ones have maintenance included.

Until they don't. Therein lies the rub.

To be fair, the parts cost on all car brands are extremely high. And there's a reason for it. Car companies struggle to make a profit selling cars. There's a lot of competition, and not a huge markup on the cars themselves. Also, factor in the cost of the warranty and recalls.

Since they can't make a lot of money selling cars, they sell expensive parts instead. And they go where the money is; insurance companies. When a car is in an accident, it activates the insurance policy. The insurance company needs to buy parts to fix cars, and since they can afford whatever the cost of the parts are, so they charge high prices knowing they can get it.