Quote:
Originally Posted by FloridaM5
Ah gotcha. Yeah, a stage 2 tune is way more aggressive than racechip will be. Modifying fuel tables, ignition, boost, etc, etc. RC gives you a couple of pounds of boost, which probably gives you 50whp, as compared to 80-130whp via a stage 2 tune.
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The JB4 adds 4 and 5 lbs of boost on its two most conservative settings/tunes. That has to be really noticeable on both the 3.0L and 4.4L X5s.