Didn't you have another spoiler on your car? It was bigger than factory if I recall correctly.Reception is important. I have the factory spoiler back on the car after painting it black, its going to stay. Anyway, I listen to mostly HD Radio and I am concerned about the reception. I don't think my 2011 had HD radio, and the stations down here in Miami / Ft Lauderdale in HD are very good, and the sound quality is a higher bit rate than the Sirius. I am concerned that the reception will be less than I enjoy.