Gerard, the rear suspension is E90 M3 and front uses E46 M3 legs. Didn't like the idea of using a heavy yank axle, better left to big yank cars or doing 1/4 mile runs
The rear sway bar underneath still complied with Gp1 as it used the original mounts, ie. drop links at the front to original mounting point. I guess it just allowed the use of bigger bars that didn't need curving over the diff. I just used the 14mm 2.8i bar but spaced away from axle tube to give some anti-tramp.