Quote:
Originally Posted by Mike@N54Tuning.com
There are thousands of the JB+ system in use over the past few years and thousands of a similar (although inferior) tune called the SSTT in use as well. Never heard of a single related break down, melted plug, or anything that would indicate they are unreliable or reduce the lifespan of the motor. Many customers have 100k miles on these tunes now. It's a 2-3psi increase over stock. The fueling is closed loop and runs the OEM air/fuel ratios and the advance curve learns out 1-2 degrees. The OEM tuning runs more boost than the JB+ does on hot days and/or high elevation. If the question is whether the JB4 is worth the extra money and install effort then I'd say it definitely is but the JB+ is rock solid reliable and probably the safest tune you can put on an N54.
Mike
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Thanks Mike for the info.