Ghost Posted August 8, 2021 Share Posted August 8, 2021 I own an Audi A3 S line 8V (facelift). There is a box underneath the passenger seat with vents on either side and on the front. I was wondering if anyone knows what it is. I do have the optional Harmon Kardon sound system, maybe it's something to do with that? If anyone has the answer could you let me know. Thank You in advance Quote Link to comment Share on other sites More sharing options...
Steve Q Posted August 10, 2021 Share Posted August 10, 2021 It might be the sub or amp. 1 Quote Link to comment Share on other sites More sharing options...
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