those 273 manis have a 1&7/8 outlet and are very restricted (but they DO fit like a glove!). I used 340 manis on a manual steering & shortened the steering coupler slightly to clear. To do it again I would investigate useing the shorter PS inner shaft (5 minute swap) and seeing if the firmfeel adapter shaft is the right length to make up the difference (& slide right past the mani). EDIT for duals cut/weld a scallop on the other side of the trans crossmember so the new dual ex pipe tucks up there neatly (just fab the scallop so it is the same on both sides)