Riding on a two-inch longer wheelbase, the Audi 90 was visually very similar to its predecessor. During the development of 90 many popular parts, such as the have been built. It is important to replace the vehicle's air filter to make sure it is performing at its best. When installing a new air filter, make sure everything is clean and the filter is properly sealed.
90 provides a large selection of high-performance parts. But after a long time, the worn 90 air filter parts might cause huge problems. An air filter should be replaced every 30,000 miles or 30 months (whichever comes first). The air filter should be checked every 12,000- 15,000 miles before replacing at your 30,000-mile interval. When servicing your air filter, you should pry open the housing (if equipped) and remove the old unit, reposition the new air filter making sure the top is facing the top and the bottom is facing the engine. Then reconnect the pins on the air filter box or reattach the wingnut (carbureted engines). Finally, reconnect all hoses and connections going to housing. There are plenty of inexpensive and quality 90 parts online. From the body parts to the performance parts, a long catalogue of advanced 90 parts is given here.