It's there for a reason. The earlier Audi TTs, a car that has a similar shape, had an issue with the rear getting light at speed with a few fatal incidents. To fix that Audi added a spoiler and then some. An engine blowing due to a cost cutting IMS is something completely different then a car that's unstable at speed. For your own safety and the safety of others be smart about a cosmetic mod that will change how a car handles.
Audi Offers TT Fix After 5 Deaths - NYTimes.com