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Sure if you're expecting it to behave like the rotated version the core is based on then you’ll be disappointed but they’re probably still a better way than say a Kinugawa TD05/06 job or half the other stock location turbo’s out there. Most seem to see the core model and think it’ll somehow flow as well as the real thing and then end up disappointed, haven't seen many that actually hate the way they behave in general.

All stock location "big" turbos suck. Every single person that has built a car with one has been disappointed with the end result, the end.

The engine isn’t running out of puff. The turbo is operating outside its efficiency point so builds up more heat so you either need a bigger turbo or inter cooler. if you have a plot with boost on it you’ll see got up to 21ps at 4K rpm then it tails off to 15psi at high rpm as the turbo is small. if you set the max boost to 15 psi it’d make more power almost at the redline as it stays cooler through the rev range. But it would suck low down and feel slow as crap. I did that for fun. Lasted all of 20 minutes before I reverted it. what you want is to have the biggest amount possible under the line on the dyno plot. That’s means it accelerates fast and throws you back into the seat. 215-220 kw is typical stock depends on the age of the car and fuel. there are 300kw stock block STI but that’s the 2L version. check out @Niran old topics for water meth and how much he made. Look for the pre insanity build not the 500wkw one. Same car though.