Just put MAC AIR SYSTEM on my 5.4 3V 2004 RUNS GREAT looks & sounds even better.cost was $240 Stainless Steel air shield and Billet Aluminum Mass Air. Check it outwww.macperformance.com Will Dyno in the next two weeks with Direct fit headers,and have mac split duals already.I know nothing increases our MPG. But this air system feels like a good power improvement,will get dyno tune & post results.
Very impressive system.Best looking I've seen & no tripped codes.