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It is hard to tell the difference because most of us have changed our exhaust systems from the turbo back and have taken our cats out. I know that when I changed my exhaust and my air intake I got about 1-2 mpg better. Hopefully that helps
'07 CC S/B Black by chrome XLT, Cab rack and UWS toolbox(s) and a Rhino in the bed. MBRP S/S 4" dual kit. Banks cold air intake. Zoodad mod. SCT touch screen, Banks intercooler w/ highram. Mag-Hytec diff covers front and rear and tranny. EGR delete. BDS dual steering stabilizer Toyo A/T's 285x75R18 4.5 D/R lift... Warn transformer w/ 9.5k winch
'99 5.0 Xplorer w/ 32" silent armors, TM headers, MAC intake, Dynomax exhaust with 234,xxx miles.