What should i do to my 2006 ford Mustang GT?

I've had my mustang gt for about a year now and i got it with 95k and ive got about 113k miles on it. Im planning once in the future once the engine dies to either get another 4.6 and just build it up or should i swap it with a 5.0 coyote engine or a shelby gt500 5.4l sc. Thats the future like in about 2 years so im saving up. Will it be better to just get another 4.6 and build it or swap it and build that engine. For now its making 280whp on the dyno. Stock only exhaust. What should i do to it for now im thinking a cold air intake and headers and an x pipe. Let me know what i should do. I dont like it stock because all the 5.0 owners always just play around with me. So im trying to gain some horsepower

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