Some A4 guys did this... can we? worth to try?
<img src="http://www.electricsupercharger.com/www-electricsupercharger-com/images/K&N_eram_airbox.jpg">
If you want something designed for the S4, look no further than AWE's S-Flo which is installed inside the factory airbox:
<img src="http://www.awe-tuning.com/media/products/awe/sflo_sm.jpg"><ul><li><a href="http://www.awe-tuning.com/pages/shared/part_detail.cfm?PMaI=1&PMoI=4&PEI=6&PP =s4_27t_drivetrain.cfm&PPT=Drivetrain&IL=S flo">A.W.E. S-Flo</a></li></ul>



