What is the best way to increase power in a B5 2.8 quattro for under $300 besides chipping?

 

Remove rear seats, a/c hardware, spare tire, passenger seat. Weight loss baby, thats the only way you're gonna gain power on a 2.8 for less that 300.
You should have looked into that before you bought a 2.8 over a 1.8t.
Other ways: Exhaust -small gain
SC, huge gain, huge$$$

 

Put ne of those exhause whisltes that sound like a blow off valve.

 

Upgrade your driver software

 

You can try putting on one of those huge spoilers, it will add instant 30hp for about 200 bucks

 

You know, if you get a smaller one and put it on the hood, that's another 30hp easy! Gotta balance that massive downforce, you know?