The kit comes with the 9# pulley. It also will hit around 10.5lbs of boost after install.
There is a guy on here that did a study on the filter vs turbo guard vs turbo guard with pre-filter with just an Air to Air conversion kit and not my full kit so he has the low boost impeller.
Turbo Guard only - 9psi
Turbo Guard with pre filter - 6psi
K&N filter - 8psi
So he was only seeing a 1psi drop to filter air vs. ingest sand (silica) which will win over your aluminum block.
I am in the middle of developing a new intake among many other upgrades. Stay tuned folks!
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