Narrowing it, 2" total, with normal, off the shelf DSE parts, Camaro hubs and rotors. The DSE sway bar fits and doesn't hit the rear shocks, with the upper mounts moved inboard.
The DSE stuff can suck in a total of 1.66" on each side, without mods. I figured .66" is enough adjustment with the custom uppers we built.
That's all new, uncut DSE links and my custom upper arms that use all poly bushings of the same durometer. Should avoid the "multi-link walkabout" people talk about.
We're assembling it with a regular rear diff, while I finish building the 9" and shafts for the Camaro hubs.
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My garage builds, with some hack and professional love thrown in: