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Twin scroll turbos are known to lose top end power due to the restriction due to the exhaust housing, it's a trade off for the earlier spool. Is it dropping boost at high rpm? Do u have a manual or electronic boost controller? My single scroll 2871 lost 2psi from 6900-7500 but when we went to an electronic boost controller we were able to compensate for it.
Is your tuner saying it's the boost that's holding u back? Or is it other factors like knock?
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2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished
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