What's should be my first upgrade on my 2005 Ford Mustanf V6?

I had my Mustang for awhile and I think it's time to get an upgrade. I'm either thinking of a Muffer.
http://m.americanmuscle.com/flowmaster-ss-axleback-0510v6.html

Or headlights and turn signals with a 8 inch antenna
http://m.americanmuscle.com/2010-headlight-smoked-0509.html

http://m.americanmuscle.com/smoked-turn-signal-05.html

http://m.americanmuscle.com/8inch-black-antenna-0509.html

Or taillights with 3rd brake light tint
http://m.americanmuscle.com/raxiom-gen5-taillights-0509.html

http://m.americanmuscle.com/smoked-3rdlight-tint-0509.html

I've been thinking about it for awhile. I just can't decide. Any opinions on the three options? Or better suggestions?

Save your money for retirement

I love these tail lights.
http://www.americanmuscle.com/raxiom-gen5-taillights-0509.html
A muffler might be most practical.

Do what you want as long as you realize you're not going to be getting any noticeable increases in HP with this car (unless you spend $$$$$ for a turbo or super kit)

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