had this issue this weekend, had an exhaust issue,cracked flange. so left car up to my usual mechanic to have a look at it. He hasn't had to work on the z yet since only got it in june, he couldn't get it onto the 2poster, too low and mine isn't lowered, he couldn't even get a trolley jack under it.
said with the two poster arms where the mounting points under it are they're too close together the only thing he could've done was use the flat metal of the lift arms itself was was dodgy, so ended up having to go elsewhere to get the exhaust repaired by a guy with a 4poster.