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Yer it’s twin scroll I was reading few horror stories about the sc turbos , do you know much about rotated set ups like a Garret or efr
the earlier sc turbos suffered from exhaust housing cracks but that's all been sorted now. regarding a rotated set up.........for 400-450bhp its a lot of work that doesn't need to be done, there are plenty of standard position turbos that will get that power no problem, it does look nice though when you see a rotated set-up.
my last impreza was a blob sti with a forged 2.5 and that was running a standard position garret gt3071r with a ceramic housing and that gave 440bhp with 475ftlbs.
have a read of this, guy had a vf37 done by turbo dynamics for around 380-400bhp-would probably be cheaper doing it that way too
https://www.scoobynet.com/subaru-pa...dynamics-garrett-twin-scroll-hybrid-vf37.html