The two model numbers of interest are the EFR 6258 (GT2860RS equivalent) and the EFR 6758 (GT3071R-WG equivalent) They are both externally the same dimensions...don't recall if this is the 62mm or the 67mm turbos here. Both have a 58mm turbine wheel, in case you didn't figure out the naming convention ;) .64 A/R turbine housing in case anyone is curious. Full details should be posted later today here: [ http://www.full-race.com/articles/borgwarner-efr-turbos.html ]
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