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it really won't take much metal out,it's more of a polish/cleaning type kit. Actual porting removes quite a bit of metal.
There are too many bad 'head-jobs' out there to make me want to diy that bit! It's definately a professional thing(pref with a flowbench)
 

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Id leave portoing to someone with a flow bench. It isnt just a matter of taking metal off here there and wherever you feel like it needs to be done. If you go sick you might end up going backwards.
 
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