GReddy 06-11 Honda Civic Si 63.5mm Supreme SP Cat-Back ExhaustGReddy 06 11 Honda Civic Si 63. 5mm Supreme SP Cat Back Exhaust This Part Fits: Year Make Model Submodel 2006 2011 Honda Civic DX 2006 2011 Honda Civic EX 2009 2011 Honda Civic EX L 2006 2011 Honda Civic GX 2006 2011 Honda Civic Hybrid 2009 2011 Honda Civic Hybrid L 2006 2011 Honda Civic LX 2009 2011 Honda Civic LX S 2008 Honda Civic MUGEN Si 2006 2011 Honda Civic Si