05-26-2020, 09:55 AM | #1 |
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HELP! F30 Catted downpipe
Hi everyone,
I apologise for this potentially silly question about downpipes. I currently have the MPE and resonator delete on my F30 as well as a Stage 1 tune. If I wanted to add a CATTED downpipe (catless is illegal here), what benefits would this have? And would there be any noticeable change in the exhaust tone/sound seeing as I already have a resonator delete? Thanks everyone. Any help would be greatly appreciated! |
05-26-2020, 02:06 PM | #3 | |
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05-26-2020, 10:21 PM | #4 |
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Thanks for your advice guys! Purely from a sound perspective, do you think that it is worth installing the catless DP? As in, would be deeper and more aggressive tone be noticeable?
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05-27-2020, 12:59 AM | #5 | |
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I've got a Fabspeed HJS catted downpipe, stock midpipe and axle-back M Performance Exhaust. I actually got tired of burbles and turned them off completely using BootMod3. Now I really enjoy hearing the exhaust sound when I step on the accelerator. Making noise braking at a red light wasn't my thing. |
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05-28-2020, 09:37 AM | #7 |
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I still cannot figure out how people pass emissions with catted/catless DP. I am thinking of getting a DP but I do not think it is worth it if you have to switch back to stock before emissions testing every couple years (NJ resident). Is there a way to avoid the not ready code?
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05-28-2020, 09:54 AM | #8 | |
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05-28-2020, 11:54 AM | #9 |
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Okay, in that case I would want to find a DP which doesnt throw a code (does anyone know of any). Second, if i am trying to go stage 2 FMIC/DP I would probably use bootmod as the tune. As far as I know you won't pass emissions in NJ unless you have 1 or less not ready codes excluding Cats. That means I have to get a different tune (not bm3?)
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05-28-2020, 11:58 AM | #10 | |
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05-28-2020, 12:07 PM | #11 |
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Yeah my father had fabspeed equipment on his 996 porsche and the quality was super good, expensive though. Would the one you ended up with fit the 320i n20?
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05-28-2020, 12:27 PM | #12 | |
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05-28-2020, 12:30 PM | #13 |
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Catted, MPE, and res delete is pretty loud. I used to have mpe and catless which was a tad bit louder. It was so raspy without the res and the catted downpipe that I elected to put the resonator back on. It cleaned it up very nicely but did take away from the overall sound and burbles.
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05-28-2020, 01:02 PM | #14 |
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AFAIK, there are no high flow cats available for N20 that will NOT cause CEL. whereas fabspeed, active autowerke and cg precision ds-1 are guaranteed not to cause a CEL for N55.
the only high flow cat for N20 that might not cause a CEL is AFE Twisted Steel, however it is using a low volume 400cpsi cat so i'm not sure how well it flows. unfortunately i have not seen anyone here that has one. ADD...stone eddy and supersprint(metallic cat) may not cause CEL but cost $1600. i have not seen anyone here with either there is an extremely remote possiblitly(but most likely not) that fabspeed could custom make one but you'd probably have to send them your oem downpipe and it would cost more than their N55 for being a one-off custom fabrication. otherwise, just get a wagner with HJS cat(if available) or ER catted along with a flash tune to mitigate CEL. Last edited by alohasurftoad; 05-28-2020 at 01:25 PM.. |
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05-28-2020, 01:25 PM | #15 | |
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05-28-2020, 02:02 PM | #16 | |
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the catalyst is really nothing more than a filter. if it's sniffer then i would think you need 300cpsi and/or longer internal catalyst length. of course, this will compromise flow. or you need to swap back to oem catalyst prior to every test. idk. |
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05-28-2020, 04:27 PM | #17 |
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I've read some replies where those in other states (aka not CA) pass with a HFC and some o2 bung extenders. You can have your o2 in ready state then and not trigger CEL.
I'll just swap back my stock DP when it comes time to smog. That or do the usual turner route of paying someone to smog.
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05-29-2020, 09:19 AM | #18 | |
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catted downpipe, downpipe, f30, mpe, n20, n20 328i, resonator delete |
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