don't waste that much money!!! Thats HUGE dollars for 'fancy pulley' when a simpler solution will do a better job!
I got an +20mm aluminium ring fitted to my crank pulley (old grooves machined off) for $150. My car now makes 11 psi-ish.
The pulley weighs about the same a stock, and still has the rubber harmonic damper ring. Do some searches for harmonic balancers....and you may find why it can be wise to retain this key feature of your crank pulley - duh - it damps harmonic vibrations.