Some people installed their own S/C in the early days were not able to get their ECM reflashed w/ the TRD maps. The cars ran OK w/o those maps at the stock 7PSI, but they were underpowered due to the ECM not being tuned for the oversized injectors. The TRD reflash (that comes w/ the S/C) is stable up to 10PSI, but that is the limit. Most pullies are 9-9.5PSI. As long as you are remapped and have a properly installed S/C, then you will be fine to run that pulley.
I have the 14.5PSI pulley from NST, as well as, the h20, and overdrive Alt pullies. The only way to run the 14.5PSI pulley is with an external e-manage, 550cc injectors, and high-volume fuel pump. Also, some type of I/C setup will be required.
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