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Map 3 is a lot of boost for the new b58tu. It’s already running a lot higher boost levels than the gen 1 b58 and the jb4 was designed for that engine. If you install the downpipe you definitely can’t be running map 3 unless you want to overboost way too much. For example on map 3 it will probably make somewhere around 22-23psi which is pushing this tiny turbo way to far without proper fueling from a ecu tune. Just head ups running map 3 way better off on map 4 since 20 psi seems to be the sweet spot on these stock turbos.
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