are those power programmers worth it? more specifically a 97 chevy silverado...

chris

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...z71 with the 5.7l v8? http://www.autopartswarehouse.com/sku/Chevrolet/K1500/Jet_Chips/Power_Programmer/1997/Silverado/8_Cyl_5-dot-7L/J2015024.html?tlc=Engine+%26+Drivetrain
i was thinking about this one
could it actually make it have over 130 hp more? like it claims
from what i know
those claims can be true...but only at certain rpms will you make that hp/torque/mpg
youd have to like keep it at 2k rpm
so they wouldnt technically be bs...but...yeah...idfk i dont use these things
 
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