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I ran jb4 on my 320i with a Downpipe and full exhaust and drop in flatbed filter. I had a custom map running 26psi which sometimes peaked at 30psi and I used 30-40% ethanol mix. The car can handle it as I used to run this map almost every week for about 4 months. I had the car running this boost from 80000km till 95000km with no issues.
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