No, the CT-26 isn't good for much above 300-350. Not efficiently anyway. A CT-26 upgraded to 57 trim is good for low 400's and fairly reliable... I wouldn't expect a lot more from it. Almost any newer turbo with a larger compressor housing will be more efficient offer a higher ceiling. A ball bearing turbo will even spool faster. Stay away from cheap, Chinese turbos. You really should talk to some mechanics in your area about this, they'll be able to explain it without the language barrier.
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