I just bought a 2002 A4 1.8 turbo awd stick.
What is a good starting point to start building up a good street racing audi? What are some parts that will boost performance

 

bigger turbo? gapped spark plugs, clean air filter, make sure you have no boost leaks or vacuum leaks.. new fuel filter, good tires.. all this little stuff isn't really going to boost performance rather get your car to be how it is supposed to be. but yea a bigger turbo

 

Would new headers and full exhaust make a difference?

 

Read the sticky posts in the B5 and B6 subforums. They'll give you everything you need.

 

Tell us your budget, tell us your whp goal, then we can go from there

 

The price im not really worried about seeing how this will be a project because I plan on keeping the car for a long time and whp mid 300

 

The FAQ threads will outline everything you need.