i have about 700$ at my disposal and i want to add hp to my 2004 silverado 4.8 ltre v8. Does anyone have any suggestions. I have looked over some headers and they claim 20-30 hp gain. But then i heard that the gaskets will leak overtime and that the hp gain is not worth the pain and suffering of replacing them. Chips, programmers,etc. anything to make more hp for less $ is good.

any suggestions is greatly appreciated.