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first, check out this video;
[ http://pease1.sr.unh.edu/aew/rc/Handchuck/PegLaunch1.avi ]second; there are basically two engines, sharing one crank.
since the intakes are split from the air filter on, there is a chance that a turbo charged engine could have problems. specifically, the drivers side of the engine could generate 400 hp potentially and the passangers side could generate only 200 hp.
if the intake were NOT crossed over, this 200hp inbalance could very well be enough to cause serious stresses on the crank, the connecting rods, the bearings, etc.... not only that, the EGTS will most likely be seriously effected since most cars only use one MAS for incoming air reference.
the stock system attempts to balance the intake by crossing over the intakes. the drivers turbo (400hp) is feediong the engine only generating 200 hp. in the end, the intake will allow the 200hp side to generate 300hp. the 200 hp side is nopt providing enough boost for the 400hp side, so it only generates 300 hp.
therefore, the stock system attempts to balance the engines intake so that the power is equal.
on REALLY high HP cars (400+(?)), it could be easily theorized that the intake cannot keep up with any inbalance that an FMIC install generates. in regards to 95% of FMICs on the market, they negate the cross over plenum. they do this by feeding the drivers side turbo into the drivers side inle of the FMIC. the FMIC outlet then goes to the passangerside of the intake. the intake crosses the air back over into the passangers side. thereby voiding the intended design of a cross over plenum. i am moderately drunk. have a pleasnet evening.
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