Fork in the 4.6 performance road

[I hate Rice]

Hello, what is prompting this is getting ripped a new a$$hole by another stang. But I am a stuck on weather to get a mac offroad h pipe (not prochamber) for 109 and a set of pullies for 159 or a bassani h o/r h pipe for 299. I care about sound but performance is so so much more important to me. Which would perform better in the short run and in the long run. These are my first mods beside the obligatory K&N. Any advice?

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97 Mustang GT Convertible
http://www.mustangworks.com/cgi-bin/...splay.cgi?1858
K&N filter
No silencer
Sidewinder 5000 Alarm

Gotta love Rice cuase they always travel in groups so you can embaress them in front of their buds.