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      07-31-2016, 04:50 PM   #2
tuan409
Private First Class
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Drives: bmw m4
Join Date: Jan 2012
Location: San Jose

iTrader: (1)

You need to put the original downpipe back in before smog test. And right now ur not getting check engine light because jb4 is set to auto delete code. Once you put the original downpipe in you have to drive it around for like 30miles or so before going in for a test. The akrapovic downpipe u got on is catless and stock has cat. Jb4 map 0 and unplug obd plug.

All u need to know about jb4
http://www.n54tech.com/forums/showthread.php?t=25401