Good morning, I wanted to know who can tell me something about open sports air filters at an Audi 100 C4 2.3l ! Does anyone have experience with it? Are there any problems with it? Which open sports air filters can be taken? Do you have to calculate the filter size somehow? I know that I do not get more power with it, the TÜV does not necessarily play along or or or…but supposedly the intake noise should improve! Just want to ask me, get tips and from others I found a lot of statements on the topic bislan on the Internet but never really concrete 🙂 Thanks and greetings Soeren