Just read all 41 pages, seems this should be something SOA should figure out (yes i know that is a naive newbie comment). I've got on 05 lowered with the S-tech's and cobb stage 1. I've had the car for a little over a month and previously never heard the growl. Well now I'm driving cross country to Colorado (colder weather and the car is packed to the brim) and noticed the growl for the first time. Looking forward to testing it in the cold without all the stuff in it to see if the problem persists. I don't mind spending some $, does anyone know a place (cobb maybe) that I could take mine to get some experts to work on it?
Would taking it to a dealer to try to get some warranty coverage work on it even be worth the time?
Also it seems the 05's predominantly have this problem, has anyone investigated potential differences between the 05 and 06+ setups?