Used on: ARCTIC CAT SNOWMOBILE ZR 900 Early Build 2003 ZR 900 Sno Pro Intl 2003 ZR 900 EFI Sno Pro Intl 2004 ZR 900 2003-2005 ZR 900 Sno Pro 2003-2005 ZR 900 EFI 2004-2006 ZR 900 EFI Sno Pro 2004-2006: This Donut fits in between Expansion Chamber & the Manifold.
