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  1. 2021+ Kia K5 Reviews
    purchased the jb4 for $530, bluetooth extension for $140, and the app for $30. I gotta say after roughly 150 miles of driving, the difference is night and day. currently running 93 octane + an octane booster. haven't taken it to a dyno yet but i would say it added roughly 40-60 horsepower and...
  2. Engine, Transmission & Technical Discussions
    has anyone bought and tested out the JB4 tune on the GT trim I've seen some good results for the 1.6t but was wondering if anyone had any experience with it.
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