Like Brett said it's a piece of cake, just to expand on what you need to keep... The hangers and the downpipe to cat back hardware is it.
2008 Legacy 2.5GT spec.B, stage 2, Snail Tuned, ERZ Catted DP, SPT Cat-Back, Epic Springs, Hotchkis Sway Bars
1990 Miata, FM 1.8L Swap
2001 Miata, FM V-Maxx Classics, 15x8 Jongbloed wheels