Yeah rotating, oil restrictor and gear linkeage issues plus a map then also turbo outlet converter ie round outlet for intercooler pipe work.
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Rachel has that turbo on her gt which made 274iirc
Them S14 turbos are decent. Same as a 2560 IIRC. Someone correct me if I'm wrong.
As for the eBay jobbies, I think it's luck of the draw, I know a couple of lads who've been running them at a bar and a half for ages and they're fine, I tried one on the clio, it would only make half a bar then **** itself after 300 miles and chucked half a litre of oil out the back of it.
Personally I'd go for a genuine Garrett unit, the second hand S14/15 turbo's seem a good choice.
I agree with the big guy.
I'd rather a used turbo, rather than a cheap Chinese one.
Get a t25g of a import s13 its same size as a gt2554r just journal instead of roller
T28r s15 turbo eBay number 190885563944
Don't know what they are worth but hope its some use to you .
That's the turbo I put up in the link above mate ^
Ah sorry mate thought it was another copy one , there's a few t28 aswell I'm sure if you've not already seen them they are laggy 4800 full boost iirc