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Alot! It costs $2000 for a set of P&P st 2 heads with bigger valves/ valve job and bronze guides. They pay $50 for a set of bare PI heads in bulk so minus the valve job/valves and guides and i would say a good$800- $1200 just for a good porting.
If you want your car to be faster, ditch the heavy, ghetto 20 inch rims for a set of 17's at most. You will probably pick up 1-2 tenths due to the reduction in rotating mass. Light wheels make a huge differance