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Reload this Page 2019 X3 M40i with JB4 Look to invest in a High Flow Catted Down Pipe
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Thechrisjones Thechrisjones is offline
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Default 2019 X3 M40i with JB4 Look to invest in a High Flow Catted Down Pipe - 08-08-2020, 02:07 PM

I'm really wanting to pull the trigger on a High Flow Catted ******** and would like to hear peoples opinions on who has the best quality/reliable one out on the market.

Also does anyone know if JB4 fixed the issue with CEL?

If I were to take my BMW in for a scheduled maintenance service is this something they will look for or see? If so can they void the entire warranty of the car? I see so many conflicting answers but they are from old post years back...

I also purchased the maintenance package, is this something they can take away from me too??
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Mike_L Mike_L is offline
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Default 08-08-2020, 05:09 PM

The JB4 cannot keep the CEL away. BMS is in California and needs to abide by the laws. Once you change the ***, you broke the law. They can’t legally auto clear the CEL without risking repercussions from the EPA.

Bmw can void parts of the warranty and maintenance plan if the pipe causes problems. In other words, it throws a CEL and you go to the dealer, they’ll see the change, diagnose it to be causing the issue, and you can kiss the powertrain warranty goodbye. SEMA helps us with a lot of warranty issues, but the second you break the law, you’re on your own.


Mike Levy
2021 Tanzanite Blue II M550i - Due at dealer 10/9
2018 Silver Equinox LT 2.0T
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Thechrisjones Thechrisjones is offline
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Default 08-09-2020, 08:05 PM

Even with a catted ********?
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Default 08-10-2020, 04:55 AM

Yep, because legally you aren’t allowed to change the *** unless the old one has over 50k miles or is faulty. That’s the Federal law. We all do it anyway, but we’re prepared to eat the repair costs should something happen, and most change back for inspections if they live in an inspection state.


Mike Levy
2021 Tanzanite Blue II M550i - Due at dealer 10/9
2018 Silver Equinox LT 2.0T
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Thechrisjones Thechrisjones is offline
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Default 08-10-2020, 05:28 AM

Wow, guess no down pipe for me then! Thanks
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