Thread: ZZPerformance HV3 Upper Insert

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  1. #1 ZZPerformance HV3 Upper Insert 
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    Ran across this when reading Bluegtp91's safe modding thread.

    ZZ Performance

    If it delivers 20-30HP for $200 then it is a no brainer, I want it. However, is this something that is safe to do when other mods are limited? While there are other things I could do first, are there any that I NEED to do before adding this insert?
    Last edited by aziff; 05-07-2011 at 06:51 PM.
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