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I have a k&n filter, 3.92 gears, flowmaster 40 dumped, and the suerchip programer. what is the next mods i need to make my 2003 4.7 a beast??? is it krc 206 cams or jba headers, which help most?
 

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The cams!!!!! You won't get much if any gains with the headers without some major head porting and a bigger cam

Andrew
 

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Yeahh I say the 206 cams are the way to go, dont waste your time with the stock H/O cams... go straight to the 206/212 cams. I know FAST MAN who is a sponsor of this site sells the 206 cams as well... they are the SAME EXACT re-grind cams that KRC sells, they come from the same vendor (CRANE CAMs). Contact him and see what he can do for you.

SPEED SAFE, AIR RAM
 

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Yes I would also heavily recommend the cams as well or the 4.56 gears. They are both a very nice mod to have.
 
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