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its called a 4-2-1 and yes its probably better, supposedly more low end power than a 4-1.
you dont need to upgrade pistons(theyre forged aluminum not tititanium) to run nitrous if you stay at around a 50hp shot on your engine.
imo i wouldnt do much to that engine, its rather weak compared to most others. maybe a 50shot of nitrous but that'd be all i'd do.
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