So my I am looking to either replace the subwoofer in my gf's 2001 audi tt convertable roadster or install an amp and just put some subs in the trunk. I was wondering how difficult this would be to do since she has the bose upgrade. i would rather have a more powerful amp to power the subs than what is in there. any information on how i can do this or where i can have it done would be cool. i am doubting that somewhere like best buy could handle this.