"Any arch work needed?"
Well - My front coilovers are wound down all the way to the bottom of the thread, and the lip of my wheels sit pretty much flush with the arch, so the arch lip itself is hammered flat lol
As for the rears, the coilovers are set a bit higher for the 'nose down' look (I like it), I've attacked the arches a little with a big hammer but not gone too far