Quote:
Originally Posted by 87GNX
Mustang has a diff firing order, 4 valves, 4 cams.....if you drop in an x pipe delete the cats, the car sings at high rpm.
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^ This. The Firing order is key to the difference between the two. It sounds different from the LsX series of engines (1-8-7-2-6-5-4-3) due to the Coyote 5.0's different firing order (1-5-4-8-6-3-7-2). Other variables also come into play, such as heads (2 valve vs. 4valve), cam (single vs. quad), exhaust, bore, stroke, compression, etc... just like the others mentioned.