twin 2860rs are only good up to 550 at most whp. anything over that the intake air temp gets pretty high and pushes them way out of there efficiency. comparing two 2860rs to a single 4094r is absolutely ridiculous. a single 4094 will.make more power efficiently and with a lower iats then 2860s any day. yea you will sacrifice a bit on torque side but the top end side of things is pretty retarded. on 16 psi of boost on a 4094r on a rev up de with cosworth cams and port work, we full spooled a 4094r with a 1.06 hotside at 4100rpm. and was on stock headers and stock intake manifold. cam timing was mild in the midrange. spool up timing was at 9 degrees and it was on pump gas.
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