Get some dual flowmasters for sure!! and if you can some MAC headers would be cool and a cool air intake isn't that much either. You might want to look into a power chip also I recommend the FORD CHIP, but if you are going to be doing a lot of different mods you might want to hold off, so you don't have to pay for it to be reprogrammed and I think there are some places out there that will reprogram for free as needed.
See ya,
Karen

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Karen Wells, Moderator
The Mustang Works Magazine
http://www.mustangworks.com
1969 Mustang (Project Rice Eater)
1999 Silver Mustang Saleen S281 (SQ car for stereo contests)
SQ Goddess
My Stereo Bro "tireburner163"