got off my arse and installed the R31 rear suspension yesterday, took just under 30min!
they seem to be similar ride height and stiffness
the R31 struts look a bit shorter, but not too much
im going to try and find the spring rates of the R31s, and then the R30, to see if theres any difference
im thinking its just the struts im meant to use off the R31, not the R31 springs
also got the old 16x7's sandblasted & powdercoated gloss black
looks pretty tough!
only problem is a tiny bit of scrape on the rears, so im looking at trying to bend up the lip about 10mm.... will see how i go