DCP Posted November 1, 2018 Share Posted November 1, 2018 My peaking under the skirt suggests to me that it has a dual exhaust. I believe the brochure says it does as well. Quote Link to comment Share on other sites More sharing options...
god503 Posted November 1, 2018 Share Posted November 1, 2018 Just looked under my navi.. Dual pipe into one cat? and dual pipe into one muffler. not what i would call dual exhaust. But im used to rice rockets here in NYC so maybe i have it wrong... Quote Link to comment Share on other sites More sharing options...
akirby Posted November 1, 2018 Share Posted November 1, 2018 I haven't seen or heard of anyone getting any significant performance gain from changing the exhaust or intake on newer Ford vehicles. Ford seems to be close to maxing out the factory performance. The best bet for any performance increase is a tune from Livernois or similar outfit. 1 Quote Link to comment Share on other sites More sharing options...
theoldwizard Posted November 2, 2018 Share Posted November 2, 2018 This is why to always use what is recommended in the manual. Using a higher octane more than what the engine calls for would work counter productive to engine performance and in gas mileage, not to mention the waste of money for premium gas. Waste of money, yes. "Counter productive" as in worse HP and fuel economy ? Highly unlikely. A few years ago, at an auto conference, there was a lively round table discussion with representatives from multiple major auto suppliers. The topic was "What if the 'standard' grade of gasoline in the US was 91 octane ?" All present agreed that it would help fuel economy A LOT ! I do know that EcoBoost engines at a lot of fuel under heavy loads to help cool the engine. People who want MAXIMUM performance out of their EcoBoost (or other turbo engines) get a special "tune" for running E85. Fuel economy goes down the toilet but power goes way UP ! A turbo engine is a type of variable compression engine ! Quote Link to comment Share on other sites More sharing options...
fuzzymoomoo Posted November 2, 2018 Share Posted November 2, 2018 Hell, just ditching that cheap crap 87 octane across the board would help big time. Quote Link to comment Share on other sites More sharing options...
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