This is the only option for the rdx that is vent to atmosphere and bolt on that will not cause problems with idle. 

Newly offered from T.S.P is our dual port blow off valve / bypass valve for the Acura Rdx 2.3 Turbo from 2007 - 2012 with the 2.3l turbocharged motor. These bov's are dual port and adjustable. You simply rotate the upper housing to balance the amount of air that gets discharged to atmosphere vs the amount that gets recirculated. This will allow you to have the classic loud Vent to Atmosphere sound, but still maintain good drive ability with the recirculate. NO STALLING & NO BACKFIRING! Exclusive design keeps valve closed at idle. 

Don't pay the obscene markup on a bov - 

These Blow off / bypass valves work awesome! 

Direct bolt on, no adapters required. 

Backed by a year warranty 
Re-buildable 
Guaranteed to fit and work