I have a 98 A4 1.8T Quattro Tiptronic that needs some serious maintenance. Instead of using the search function to find everything specifically and get individual repair costs, I want to consolidate everything in to one lump sum in one post. In addition to crucial repairs and maintenance, I want to do a couple performance/visual upgrades. Any help you could provide would be greatly appreciated. I’m really naïve when it comes to this stuff.

Current Mileage: 74,000

Problems
Check engine light flashing – Car sputters and has minimal power
ABS light on/Brake light flashing
AIRBAG light on
Clunky/Clicky sounds coming from front end (just did control arm and a tire rod for $830 … are we thinking CVs?)
Rapid Clicking noise coming from turbo area when RPMs are on the way down
Timing Belt probably needs to be done soon


Upgrades
Body kit
Boost gauge
Clear Corner Blinkers
Better Turbo
RIMS (I have some stock 17” S4 rims laying around that my buddy gave me for cheap – Will they fit??)
Sport Suspension
Fog Lights

Clearly I have a lot on my plate. I have approximately $4,000 to play with. I want to make this car run smooth and fast again. I need to get a few more years out of it.

Would anyone be willing to give me some ideas of what brands of parts I should buy for these repairs and upgrades as well as the cost for doing such?

Is there anything you can think of that I should consider doing while I have this thing taken apart as preventative maintenance?[/align]