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I would just get the pulley changed on the upper, if you go zpe upper you can change the upper in 5 minutes and use griptec pulleys. Some run 2.75" and some at 3.0". That way if you want (likely will at some point) to change pulleys you can. It probably same cost as an ati lower.
If you add catless headers you will have less boost too.
Stock lt4 pulley belt will not be same due to spacers.
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