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Originally Posted by 2013zboii
...is it worth it for me to add a test pipe?
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It all depends on how much a few extra horsepower is worth to you. Probably not. Especially if you live in an area with emissions checks.
Quote:
Originally Posted by 2013zboii
...I also bought a stillen lightweight pulley.. worth it?
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Unless this is a track-only car and you understand what a harmonic balancer does, no.
Quote:
Originally Posted by 2013zboii
should i let a shop install these??...
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Unless you have worked on cars (or other mechanical equipment) before and have all the proper tools, probably yes. Neither is a job for the inexperienced mechanic.