Q means quite.
i like my turboxs, its loud. the new ones though have a resonator so they're a little quiter, you could always cut it out. i have no idea what they are thinking trying to sell a 11+ for $1200 when the 08-10 is only $750. but you could get the 08-10 and it will fit. if you want Quad tips you could always add them like i did for $110. hit up boostaddict on 3gwrx.com, tell him i sent you for the best price on TXS stuff.
Scott-2011 WRX 335HP 394TQ 93 VF52!