2002-2005WRX · H4.1994cc
Notes: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2006-20112.5i · H4.2458cc
Notes: 2006: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2008: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2009: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2006-2011Outback Sport · H4.2458cc
Notes: 2006: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2008: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2009: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2006-2012WRX · H4.2458cc
Notes: 2006: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2008: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2009: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1 · 2012: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2006-2007WRX Limited · H4.2458cc
Notes: 2006: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1 · 2012: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2006-2012WRX STI · H4.2458cc
Notes: 2006: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2008: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2009: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1 · 2012: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2006-2007WRX TR · H4.2458cc
Notes: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only
2007WRX STI Limited · H4.2458cc
Notes: 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1 · 2012: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2009-20102.5 GT · H4.2458cc
Notes: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only
2009-2012WRX Premium · H4.2458cc
Notes: 2009: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1 · 2012: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2010-20112.5i Premium · H4.2458cc
Notes: 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2010-2012WRX Limited · H4.2458cc
Notes: 2006: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2010: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1 · 2012: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1
2010WRX STI Special Edition · H4.2458cc
Notes: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only
2011-2012WRX STI Limited · H4.2458cc
Notes: 2007: 1.625 Primary Tube; 2.25 in. Collector Tube; T-304 Stainless Steel;Off-Road Use Only · 2011: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1 · 2012: For Competition/Offroad Use Only; Not Intended For Public Streets/Highways~ Not Emissions; DOT; CARB; Or EPA Certified 1