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biggest advantage i noticed with the precision billet 67 is that the turbine wheel is a regular p-trim size but looks very similar to a garrett gt wheel. which flows better vs its size. most p-trim wheels i have seen fall off at anything over 25psi. this went up to 27psi no problem and making steady power at each psi level between 23 and 27. i would have taken it all the way until the turbo ran out of steam but i needed a bigger wastegate spring as i maxed out the boost controller. i currently have a 16psi spring in there. im going to move up to a 20psi wg spring over the winter and max it out next year. car is moving very well right now so going to have some fun for the rest of the season.
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