My Cart


IAG Performance Air / Oil Separator (AOS) Competition to Street Series Conversion Kit For 06-14 WRX, 04-16 STI


Center an Image using text align center

The IAG AOS conversion kit is designed to switch the upper breather portion of the Competition Series AOS to the Street Series AOS on the 2006-14 Subaru WRX and 2004-18 STI. The kit includes the new billet aluminum Street Series double breather, 1/2" hose, 3/8" hose with integrated PCV valve and breather fitting, 90-degree fittings, straight unions and associated hardware.


(x1) IAG Street Series Air Oil Separator Upper Breather Port

(x1) Upper Breather Port O-Ring

(x1) M4 x 8mm socket head screw

(x1) 1/2 inch hose (39 inch length)

(x1) 3/8 inch hose (27 inch length) with PCV valve and breather fitting

(x1) 1/2 inch straight barb union fitting

(x2) 90 degree 1/2 inch fitting

(x10) 8 inch zip ties

(x1) 11 inch zip tie

(x1) 5/8 inch vinyl cap

(x1) 5/8 inch to 1/2 inch straight barb union with 2 inch of 5/8 inch hose

*This kit converts vehicles with part# IAG-ENG-7251 to IAG-ENG-7151

*This kit converts vehicles with part# IAG-ENG-7250 to IAG-ENG-7150

**This kit is also used to convert vehicles with obsolete part# IAG-ENG-7200 to part# IAG-ENG-7100.

This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to