I bought some of the parts from ECS but I totaled my car. I have the following parts for sale from my B6 A4 3.0:

Used 3.0 Stock Exhaust

New Mann Air Filter
$19.95 from ECS

New Mann Fuel Filter
$7.95 from ECS

New oem Lug Bolt
$24.75 for 5 from ECS

New Oil Filters
(I have 8)
$8.99 each from ECS

Used K&N Air Filter with cleaner
(a little dirty)
$49.95 from ECS

used A4 front black Leather Seats. Driver seat is powered
(no head rests)

Please just make an offer for them. I am located in Southern California if anyone wants to do pickup.