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IMO, if you already have MHD give JB4+MHD a try. BEF is free and all logging is done thru the JB4 interface or app.
It's definitely smoother, but not as smooth as MHD flash only. When I was FBO stock turbo my car was noticeably faster with JB4+BEF rather than MHD OTS MAP's.
Again, this is my experience. One of the main reasons I've stuck with JB4+MHD is because of the meth control.
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2008 MB 335i-SOLD
2011 AW 335i M Sport- SOLD
2011 BSP 335i-SOLD
2011 BSP 335is- FOR SALE
2018 YMB M3- Current
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