After resurching, TRD/Modelista may very well be building a supercharger for the 86. Now the more critical question is whether this version/kit will be imported here (US/EU). DI injection is not a problem for supercharging. Autodelta built the first DI supercharged engine.
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Originally Posted by Autodelta
The Autodelta JTS Super has become the first supercharged production version of Alfa Romeo's highly-rated JTS (Jet Thrust Stoichiometric) direct injection petrol engine in the Gt Coupe, and in fact Autodelta are the only firm worldwide to offer supercharging technology on the Alfa Romeo JTS engine. Direct injection engine allows a slightly higher compression ratio to be used, resulting in improved fuel efficiency at low and medium revs. The improved fuel delivery system allows a lowering of emissions, particularly during the 'cold start' procedure. Power output of this engine has been raised by Autodelta to 220 bhp @ 6,600rpm while the peak torque delivered is boosted to 192 lb/ft @ 3,400rpm. Price includes installation
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What Subaru is going to do is another thing. And I really don't think they'll supercharge this engine. They would only turbocharge it. We have still to know this car was meant to be NA but in the purpose of being modded, so they very well new many will want to add forced induction, so they surely made the engine good for this. A turbo/supercharger kit costs arround 5.000 € in general. For example Autodelta built such kits for all engines. Why wouldn't it be possible to see lower priced kit for only one engine?