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don't know... to me seems like IMSA increased acura and cadillac min.weight as mazda received a weight ballast too.... basically to penalize everyone.
About gt-r gt3 engine, last year at WG, nismo introduced 2018 specs engines, made with lighter parts but extremely unreliable... infact both ESM had several engines failures during WG week-end and could field just one car at mosport waiting for fresh 2017 engines.
Being DPi basically a bop class, bespoke engines are allowed, but guess coswroth-nismo V6 3L is too expensive... and basically worthless since dpi can't have more than 600-620hp.
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