What mid-pipe maintains secondary cats?

seis-speed · 08-17-2020, 01:27 AM

I am assuming the N55 does?
Are there any other options for maintaining secondary catalytic conversion with a non-stock mid for better sound.

Thanks.

CarJunkie · 08-17-2020, 03:53 PM

Quote:

Originally Posted by seis-speed

I am assuming the N55 does?
Are there any other options for maintaining secondary catalytic conversion with a non-stock mid for better sound.

Thanks.

N55 mids have no cats, which is why they are used as an OEM "mod" for N54 cars. I doubt any aftermarket mid pipe would have secondary cars.

If you are needing to pass smog test regularly, I'm pretty sure you'll need to use the OEM pipe. If not worried about emissions/smog testing, go for the MadDad!

FYI, there is no O2 sensor after the secondary cats so a mid pipe with no cats will not throw a code or interfere with cat readiness. The only way it would potentially fail is if your inspection includes a sniffer test.

Mogge94 · 08-18-2020, 07:22 AM

Only midpipe that i can think of could be Supersprint, they tend to offer a lot of midpipes / link pipes with cats. Maybe just have a look

HP Autosport · 08-23-2020, 05:32 PM

You can always make one but will not be smog legal.

08-17-2020, 01:27 AM	#1
seis-speed #savethemanuals 2431 Rep 1,969 Posts Drives: 1M \| GT3 \| J392 \| GRc Join Date: Dec 2009 Location: West Coast iTrader: (0)	What mid-pipe maintains secondary cats? I am assuming the N55 does? Are there any other options for maintaining secondary catalytic conversion with a non-stock mid for better sound. Thanks.
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08-18-2020, 07:22 AM	#3
Mogge94 Second Lieutenant 93 Rep 253 Posts Drives: 1M Coupe, Z4M Roadster Join Date: Oct 2016 Location: Bavaria, Germany iTrader: (0)	Only midpipe that i can think of could be Supersprint, they tend to offer a lot of midpipes / link pipes with cats. Maybe just have a look
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08-23-2020, 05:32 PM	#4
HP Autosport Supreme Allied Commander 3816 Rep 54,319 Posts Drives: F80 M3 Join Date: Mar 2007 Location: Santa Barbara, AP, Brembo, GIAC, Koni, Ohlins, Performance Friction, www.hpautosport.com iTrader: (36)	You can always make one but will not be smog legal.
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