One more recent update, a DIY 2.75" cat-back exhaust, with a straight through muffler and dumped before the rear axle, so that it doesn't have to snake over the axle. Factory exhaust went down from 2.5" to 2.25" in the flexible section, now it's at 2.75" all the way to the back.
Trip computer showed at least 0.2L/100km drop on a trip I do a lot, the transmission is more "eager" to shift into 5th before 70km/h and I can now accelerate from under 60km/h in 5th gear.
I still need to test the actual manifold pressure at 110km/h cruising speed, in the past it was 1240mbar, curious to see if it dropped a bit and then install an O2 sensor to check fine-tune the A/F ratio. The actual injected quantity was at times on the last trip under 15mg/stroke, below the threshold where I increased the fuel rail pressure, so I need to update that too.
Next on the list is a more modern turbo, which should also help VE because of freer flowing exhaust housing. Not installing it for the economy gains, but for the 200kw power target
