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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > NA N52: Any replacement cats that will pass smog but are high flow?



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      09-04-2014, 10:29 AM   #23
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Quote:
Originally Posted by Chrisar82 View Post
Can you provide proof on the N52 having a less dense cell than the N51 in the main cats?
They do have different part numbers.
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      09-04-2014, 12:30 PM   #24
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Originally Posted by Chrisar82 View Post
Can you provide proof on the N52 having a less dense cell than the N51 in the main cats?
almost sure its different unit, if you check real oem, part number is different, also its more heavier.

most likely its a 800 cells unit SULEV standard for N51, 400-600 for N52.

anyone can confirm, please fill in.
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      09-04-2014, 01:47 PM   #25
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Originally Posted by SlickE90 View Post
I just did my smog a few weeks back and he used the obd to pass.
Opened the hood too? I havent seen norcal smogs do obd yet.
Had my car smogged yesterday. The tech opened the hood for visual inspection, checked underneath for secondary cats and hooked up his computer to the obd2 port.
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      09-04-2014, 02:15 PM   #26
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Originally Posted by OlivaresAnthony View Post
Had my car smogged yesterday. The tech opened the hood for visual inspection, checked underneath for secondary cats and hooked up his computer to the obd2 port.
yea they check all cats, especially test only station. they have long handle mirror can reach underneath the car.
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      09-04-2014, 08:22 PM   #27
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Quote:
Originally Posted by TheSt|G View Post
They do have different part numbers.
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Originally Posted by jc5988 View Post
almost sure its different unit, if you check real oem, part number is different, also its more heavier.

most likely its a 800 cells unit SULEV standard for N51, 400-600 for N52.

anyone can confirm, please fill in.
Hmm yes they do. They both say ULEV2 though in the supplement. Isn't the N51 supposed to be SULEV?
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      09-04-2014, 08:42 PM   #28
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Quote:
Originally Posted by OlivaresAnthony View Post
Had my car smogged yesterday. The tech opened the hood for visual inspection, checked underneath for secondary cats and hooked up his computer to the obd2 port.
Cool, my 2ndary cats are still "there".
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