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Yeah I use Deka IV's 630cc, at about 65% duty making 231bhp.
A stage 2 T3 may struggle to hold 20psi on a 1.8 the .36 exhaust housing will be very restrictive, stage 3 would be much better IMO.
I was hitting 106% duty with my VXR injectors and that wasnt at full load either, so better to go with the Deka IV's or greys if you happen to have some kicking about.