I have a custom exhaust bent over the axel.
I have cheapo coilovers, and they have now failed.
I am going to upgrade to the same coilovers you are talking about, i would recomend changing all of the bushes on the suspension, with powerflex ones, or just new standard ones. And also the top mounts.
As when you go low they get battered to bits. I Changed them all and fitted the coilovers, done about 20k on them, and my car is literally falling to bits suspension wise!!! Totally needs an overhall. Next week