Brian, double check with them if they are considering the right location of the filter in the x3. Even at $80 an hour, i wouldn't think that's a half hour job. You don't want any "surprises" after the job is done!
On Most other bimmers it's under the car and that would be about right the quote.
"If everything seems under control, you're just not going fast enough"
River City Bimmers Chapter
2005 X3 3.0i
ZPP, Htd seats, Htd strng, Black Sapphire on Terracotta.
1995 ///M3 Coupe
, Lux, MT, Htd seats, Cosmos Black on Black.