If you want a turbo with the exact same fit, boost and power then get the same T3!
If you don't mind adapting the exhaust flange to fit then Mamba have a GT2860R with T3 flange. It's actually be capable of much more power than a stock Coupe T3 but at stock boost the power would be similar.
Re: A new make of turbo: Kinugawa turbo build and test
[Re: kj16v]
#1549983 19/09/201504:5019/09/201504:50
Kinugawa make a TD05H 16G 6cm with T3 flange. The wastegate actuator may need some re-jigging but otherwise should be an easy fit. This should spool up faster and is capable of more power