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There isn't an easy way to narrow the offset increase at the braking system. There are too many factors, because if you pull the rotor in then the ebrake shoes don't line up, and the 944 aluminum backing plate will need clearancing for the rotor and something done to center the caliper. It may be possible to narrow the steel IRS arm itself (26mm would be ideal because you can use the T3 auto axles). Depending on the wheel and offset you are running, the 944 offset increase typically isn't much of an issue. A 7et55 wheel with the 944 rear (steel arm) setup fits quite well under stock fenders aslong as the tire choice is conservative.
Asfar the offset of the different 944 rear setups:
The early 944 setup (steel arms) increases the track. By how much is actually debatable because all 944 rear setups use 22mm spacers and longer studs. The 86T aluminum arms are the same offset as the steel arms with the 22mm spacer. The 87+ aluminum arms are about 24mm more than the 86T alum arms. I have to actually measure these numbers one day to see how they relate to the stock T1 rear drum setup. If anyone has some hard numbers for this (that they have personally measured), I'm sure everyone here will appreciate it.
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