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when i had my OFT, the v4 tunes were trash. Issues like what you're describing and random rough cold idles.
OFT/Shiv don't really care about this platform anymore (kind of expected tbh its at the end of its run) so i wouldn't expect things to improve any time soon.
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2013 FR-S 10 Series ~75k (SOLD)
RCE SS-1 Coilovers
Corsa Catback
Edelbrock Supercharger installed @ 50k
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