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Old 09-23-2013, 10:05 PM
roo roo is offline
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Join Date: Dec 2011
Location: texas
Age: 55
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Vehicle: 2013Express,2014 Charger R/T
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Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Originally Posted by Red-Stripe View Post
Not surprised at all. MPG is achieved at 1,200-1,800 rpm's. At those RPM's the stock system is oversized and there is NO restriction with a clean filter. Then factor in when it drops to 4 cylinders at those Rpm's and you have less air flow than a squirrel fart.
Do you really have less air flow, part of the gains from switching from 8 to 4 is to lower pumping losses by opening the throttle up plate further. I do agree that the stock setup has more than enough flow for part throttle operation and more than likely WOT operation also. The RAM air box is pretty nice as is.
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