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It's done just under 90k genuine miles. 
Basically something smaller like a GT28 will have good all round performance. On boost quickly and hold it to red line but overall power is limited. But with big figures you need big everything else. this is helpful. It was a friend who mentioned The bigger turbo. I think the GT28 is the one so same question but GT28 
A GT28 is a good turbo to go for. I think you get a 2860., 2871, 2876. You can possibly get a 3071 aswell so theres plenty to choose from but its not just a case of throwing on a turbo and all will be fine. You need to determine where you want boost to start and how much boost you will be running. If you want it to start at similar rpm to the ct20b then you will need to get the right size turbine wheel and housing etc. Smaller usually starts earlier but doesnt have same peak power as a larger turbine housing will. My 3076 came from there.(and perhaps its gtx equivalent) is probably the only gt28 sized turbo that is going to be worth considering over the ct20b.(eg. 17 to 18psi) you would gain a minor increase in power and perhaps a few hundred rpm improvement in spool over your current turbo. 'no compromise' turbo in that it offers you the best of what a small turbo can offer...but as to whether the performance upgrade over the ct20b is worth the ££££ it will cost is down to the individual.- I think that's certainly up for debate. I personally had a gt2860rs and a gt3071r fail in relatively short periods of time. Both times the reasons were suspected incorrect oil restrictor sizes. I think you'd be doing extremely well to get anywhere near 90k out of one of these turbos 
Mapped to 1.2 bar on Apexi FC. 
Where did you get the CT20b refurbished and cost? I might just end up doing that... What do you think?Rev3-MR2-Turbo wrote:Red what BHP are you getting.
Car is putting out 306bhp @ 1.2bar£612. to rebuild that ct20b?