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I had the jb4 on my n55 and recently switched to bm3. The two are worlds apart...bm3 is superior to jb4, from smoothness, power, ease of customization, as well as install...there's no comparison. They came out with customization sliders for the OTS maps, so you can control things like cold start on/off, cold start rpm, disable cat readiness which keep the CEL off, and a ton of other features. Now that bm3 can be flashed via obd2, I regret stepping into the jb4 world. Sold it on ebay a few weeks ago
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