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Message: <blockquote data-quote="wanganstyle" data-source="post: 573715" data-attributes="member: 21946">E34 has tendancy to vibrate when front thrust arms are out. Also when steering box/linkages is going out, I have had this happen on laguna seca, very irritating to chase down. Best idea find a very experienced BMW sifu who wont pillage your bank account. Thurst arm bushing is famous for vibrate like crazy at 100kmph or so, when accel and braking it feels like your tyres will fall off!I have ran 2jz-gte with US twins and 3" downpipe BPU modified with 91 octane poop gas, it is ok actually -the knock sensors drop ignition timing, life goes on. Obviously if you run a 110 octane racing it will be different, the  If going to boost up the original 1J injectors will be on the small side; the 2jz has 440cc and 550cc in USA format. Tuning is also the most important - the 2jzgte is smart enough to map ignition according to fuel.6 speed gearbox is avail from MK4 supra (v160 or v161)... the late model JDM spec Non turbo JZA80 had a 6 speed V161 getrag also.the 1j will directly bolt up a 6 speed getrag; propshaft will need to be shortened as the Getrag-6 is longer, 1JZGTE r154 native pull clutch should be able to be retained.</blockquote>