Well Fast intentions exhaust gains a lot more then 5 horsepower. I believe its more like 15-20hp if im not mistaken and adding some test pipes will get you another 8Hp or so plus be a 30 pound weight reduction.
As for custom vs. HKS, Greddy etc i would say it is worth the extra money unless the "custom" exhaust has done some R&D and dyno pulls to make sure you wont be losing horsepower.
You really are paying for the name and the research. Its just my 2 cents but i would say spend the extra money and get a Fast intentions exhaust with HFC's or Test pipes.
Hope that helps
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