Yeah, the front subframe is held on with 6 bolts - and the front engine mount is bolted to the front subframe.
4 (17mm) bolts for the front subframe are from the bumper irons > subframe > chassis
2 (13mm) bolts for the subframe are for the subframe > chassis
By removing the main 4 bolts, your putting a lot of strain on the remaining two bolts - easiest thing to do is just stick a jack with a block of wood under the g/box and jack it up until you see it bear the weight of the engine. Then skooch under the car, and undo the 17mm bolts - you can spot them through the round holes in the chassis leg area. The bumper then just pulls forward, make sure you unhook the indicators before pulling it completely out.