I have a very weird issue. I would like to add more power to my car but it keep it as quiet as possible. I don't mind spending money but I work in sales and have to keep a professional appearance. My car is a 2000 A4 1.8t. Any help would be appreciated. My car has a drop in K and N andEibach pro-kit shocks and springs.

 

get a 2.5" turbo back and keep a cat, res and muffler and it will be fine. Also since you have a stock airbox, the turbo will be quiet with a chip, same for dv