10-09-2017, 03:42 PM | #1 |
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Catless downpipe. Can I add a cat?
Hi
I fitted a Vrsf catless and find the smell too strong and sound too loud. Would it be possible to add a cat somewhere along the exhaust instead of replacing the vsrf with a completely new catted downpipe? Thanks
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2018 F30 BMW 340i M Sport
Injen EVO intake, OEM 437m rims, Catted VRSF dp, Magnaflow catback, Activ8 piggyback, Pedalbox. |
10-09-2017, 04:29 PM | #2 |
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You could but would you really want to. It would take quite a bit of custom modification. The better bet would be to go back to stock or get a catted DP like the one from aFe.
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2014 F30 335i, M-Sport, 6MT, V804s, custom exhaust, CTS Turbo Intake & IC, FTP CP, VRSF DP, TMS Strut Brace, BM3 Stg 2, AEM WMI, H&R Sport Springs (381 whp, 429 wtq on Cali 91oct before WMI). SPI Films Blog/DIY Vids |
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10-10-2017, 12:15 AM | #3 |
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Short answer is yes, you can add a cheap Magnaflow/Catco catalytic converter somewhere down the line.
Two challenges to consider: 1) Post-cat o2 will need to be extended. 2) Cat efficiency maybe bad enough to trigger a CEL/code since the cat is not heated as much further down the system, therefore your post-cat o2 will read more oxygen in the exhaust.
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10-10-2017, 01:51 AM | #5 |
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Btw i paid 350aud labour to fit the Vrsf. A catted Wagner would likely cost me 1200aud plus another 350 to install.
I figure adding a cat would be the most cost effective way to achieve the desired end result. |
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10-11-2017, 03:26 AM | #6 | |
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Smell bothering you?
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10-11-2017, 05:04 AM | #7 |
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Non-ready status? In my state our cars don't need to be emissions tested unless the police or Inspectors issue u with a defect notice. Is that what you're referring to?
Yes smell and noise bothers me. The smell as I'm asthmatic and my wife is pregnant |
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10-11-2017, 07:34 AM | #9 | |
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And besides, a 200 cell is about $150 Aussie. Can't see an exhaust shop charging more than $250 to cut and weld on a flange for it to fit. |
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10-11-2017, 09:20 AM | #11 | |
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If smell and noise bother you, you should stop modding your car right a way. Now if it because the wife is pregnant then wait for the mods or get her a damn SUV. Don't cheap out for your kids.
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10-11-2017, 09:33 AM | #12 | |
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In the end it will be cheaper and cleaner install and you won't have to mess with things downstream from teh cats and in the exhaust. Mike |
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10-11-2017, 03:10 PM | #14 | |
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Thanks but the question was catless vs adding a cat to existing setup. I won't go stock. Last edited by misguided_will; 10-11-2017 at 03:36 PM.. |
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10-11-2017, 03:37 PM | #16 |
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10-12-2017, 07:02 AM | #17 |
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I am not sure what kind of 200 cpi cat you are talking about but I had some cheapo kooks cats on my LS6 with kooks headers and it smelled like gas still.
What did you think of the Saab turbo X listed in your sig? |
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10-12-2017, 03:00 PM | #18 |
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Stock Turbo x sounded phenomenal. Was no need for a exhaust work. Loved that car like a step child.
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10-16-2017, 06:45 PM | #19 |
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10-18-2017, 11:49 AM | #20 |
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I am not sure where you are located but I have a used ER catted downpipe for sale. I had it for about two weeks but it started to throw a cel so I went catless
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10-18-2017, 04:12 PM | #22 | |
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I run a catless DP and the cheapest fix is to simply roll the windows up and the DP's really only at it's loudest on cold starts for the first ~15 seconds. |
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