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as has been said the BMW gearboxes have much different ratios to the Nissan boxes, so can often ruin your gearing.
the bmw diesel boxes are the most common ones, with the larger shafts. so 330d/530d.
some people say the e46 m3 box is the same as the r34gtr and the v160 supra box.
the rb25 box is the same as the z32 box and some truck things you guys get.
the early 350z box has loads of issues, the later cd09's have better syncros but are real expensive over here as the 350z guys all want them too.
s15 asin 6 speed is made of chocolate and wont like big power for long.its the same as in is200 and mx5.
I went rb25 box as it ws the simplest route but id expect it to blow 3rd at decent power levels.
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