$4000 for a years maintenance

Lemme guess that was for an oil change and new plugs at the dealer.

Last time I dropped $4000 in one hit on my car was for a turbo upgrade to 280hp!
I spend more money on mods than on maintenance. Then again I fix EVERYTHING, except for body work on this car.
Realistically for $4000 you could get a 3L with a rebuilt trans and quaife put into a car. What the hell did you spend $4000 on?