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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Difference in jb4



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      03-31-2013, 10:09 AM   #1
mtraaan
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Difference in jb4

So I recently bought a jb4 from a guy. Real good guy and seems to know what he's talkin about. He even installed it for me. He said he bought it last aug. aug 2012. He says its a jb4 stage 2. But I don't see anything other than stage 3 for the n54. I mess with it and drove it around. Definitely feel amazing gains. But how do I know that I didn't get ripped off for the jb+?
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      03-31-2013, 11:13 AM   #2
igotag
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When he installed it did he remove the air box? If so he probably installed a JB+, if he removed the cover for the DME on the passenger side up by the firewall you have a JB4.
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      03-31-2013, 11:22 AM   #3
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Quote:
Originally Posted by igotag View Post
When he installed it did he remove the air box? If so he probably installed a JB+, if he removed the cover for the DME on the passenger side up by the firewall you have a JB4.
This
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      03-31-2013, 12:25 PM   #4
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Press your volume and channel button down at the same time...if nothing happenes then its not a jb4.
Oh and stage 2...maybe its a jb2????
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      03-31-2013, 12:45 PM   #5
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Yeah I can push down the 2 buttons and change maps. And we removed my oem intake when installing the charge pipe. But I saw him put in all the wires in the ecu. But he kept saying its a jb4 stage 2 and I just can't find anything on a stage 2 other than on the website it says stage 2 is the jb+
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      03-31-2013, 12:50 PM   #6
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And your car is an N54? The N55's JB4 is called stage 2. If you can change maps with the steering wheel I wouldn't worry
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      03-31-2013, 01:11 PM   #7
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Alright thanks for the info!
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