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I suspect you'll need a 3.2 transfer box due to the gear ratios which will differ from the 4 cylinders.

Hi Mark I had this on a BMW 6 series I owned. I had recently changed the oil and cross threaded the oil cap. Therefore the engine was trying to breathe though it. The diagnostic check showed an air mass problem, but luckily problem spotted by mechanic before money changed hands. Tony

Unfortunately most of these warranties aren't worth the paper they're written on. My advice would be to source s second hand gearbox or get a second opinion.

35mm should be fine. Go for a springs and shocks package not just lowering strings. Bilstein kits are supposed to be very good (b12 pro)

Welcome to the forum you'll find the members on here are a friendly and helpful bunch 🙂 I agree with Steve on getting a diagnostic check to see what fault codes flag up. There's no point tuning a poorly car. Dark side developments, thanos tuning and Revo are all supposed to be good. What ever tuner you use though make sure they have a rolling road for best results with any remap. You can also combine it with a stainless steel exhaust I can give positive feedback of powerflow. As well as having an upgraded panel air filter or induction kit. You could also look at an upgraded intercooler or turbo if you're considering serious power.