I recently replaced an OEM downpipe on my 2015 GTI and the sound was too aggressive for my liking so I decided to replace the OEM resonator with a Vibrant 17930. My local muffler shop did the job in 25 minutes for $80 and all I can say is that the difference is finite and is a day. I drive a Unitronic Stage 2 with a CTS downpipe with an OEM exhaust and now my car sounds like it did when it was stock. I am very satisfied with the performance of this product.