Honestly though. The BEST way to do this is to just weld a wastegate into your L pipe. You can then set the exact amount of boost you want to run. If you have a 10 psi spring in there you would be limited to 10 psi. The reason this is better than swapping a pulley is that you get all the down low and mid range benefits of hitting boost faster but will limit the top end so you dont overboost.
There is a guy on this forum (redondoaveb) that is doing that except he has a boost controller and will run around on 9psi or so but then switches to his race tune and hits 14psi. Its pretty cool.
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