Ebay UEL header, cat section from an 04 impreza, rear o2 sensor moved up to behind the first cat, and second cat removed. 12 inch glasspack, flex pipe section and full 2.5 inch exhaust into dual 3inch tipped blast pipes
Just google Impreza rs UEL header and you’ll see several websites that sell them from 80$-$100, I got mine on eBay 3 years ago but there’s almost none on eBay anymore