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I still have the stock downpipe. There is no resonator. The magnaflow muffler replaced the resonator. I'm using 3" in and two 2@1/2" out. It's pretty simple really, the exhaust shop charged me $350, which included the 4" tips and the magnaflow muffler. A it's not too loud at all

I replaced the stock resonator with a magnaflow and ran straight pipes out the back. At idle it's not much louder,but when you get on it, it sounds much better than stock!

What about the active grill shutters? Can you still keep them on?

5.4 auto 3.15 gears. Air raid tube with stock box and k&n filter. Resonator replaced with magnaflow muffler, straight pipes out back No tune or I.C. Yet....