03-22-2018, 08:26 PM | #1 |
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Options if I remove my c4tless downpipe (F30 335i EWG JB4)
I've had my 2014 F30 335i (EWG) for over 4 years and been running the following mods for almost 1.5 years:
JB4 with EWG & Flex connectors BMS Intake VRSF c4tless downpipe VRSF chargepipe E85 mix (~E25?) Map 5 and hitting ~16+psi Old JB4 firmware with no CEL Car pulls hard and I really love it. I've surprised many other higher powered cars but I'm not trying to brag about kill stories here. But the c4tless dp has become a bit of a headache as it needs to be removed for emissions and the car stinks specially in my garage and in traffic with windows down. I want to look into other mod options either with stock cats or good aftermarket cats with no CEL. I'm open to suggestions but I'm interested in similar power levels as my current setup. I'm flexible so let me know what you think. I'd like to keep this car for a couple more years!
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03-23-2018, 03:50 AM | #2 | |
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how much you think you will loose max hp (not midrange but max hp) installing stock dp on? probably 10hp, but not 20-30whp like downpipe sellers declare.
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03-23-2018, 05:07 AM | #5 |
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300 Cell Sports Cat may be the answer.
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03-23-2018, 06:44 AM | #6 |
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03-23-2018, 11:24 AM | #7 | ||
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I'm worried a catted dp may not pass emissions and I've yet to find a catted dp that guarantees no CEL or emissions issues. Quote:
Any specific one you tried and does not trigger a CEL? Exactly
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03-23-2018, 11:28 AM | #8 |
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I'm thinking someone must have good experience with an aftermarket hi-flow catted dp or even another combination of mods on stock dp??
How about with more serious mods... Has anyone gone with aftermarket intercooler and seen measureable benefit on stock dp? How about fuel system upgrades etc? Or even aftermarket turbos? That's not where I was trying to go with this thread but it appears focus for modding an F30 N55 during the past 2 years is on tunes instead of piggy-backs, but from my research those tunes don't add much more value (power) with the restriction of a stock dp.
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03-23-2018, 12:18 PM | #9 |
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unfortunately, as you've already noted, the stock downpipe is the bottleneck. if you go back to stock, no sense in going too crazy in front of it. an aftermarket FMIC is something missing and would be a good addition to your setup. imo wagner's competition evo I would be appropriate since it is lightweight and has a tube fin core but there are cheaper bar-plate stepped cores that would do almost as well if you didn't want to spend that much.
for high flow catted downpipes look into fabspeed's sport cat with HJS 300cell cores. it's not cheap, though. EDIT: a GFB diverter valve is also another thing to add Last edited by alohasurftoad; 03-24-2018 at 01:06 AM.. |
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03-23-2018, 01:21 PM | #10 | |
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03-23-2018, 01:24 PM | #11 | |
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03-23-2018, 04:26 PM | #12 | |
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03-23-2018, 06:54 PM | #13 | |
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+1 Fabspeed. HJS cat is quoted 93% as much flow as catless. |
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03-23-2018, 09:28 PM | #14 |
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Hopefully the cost won’t be anywhere near crazy like fabspeed.
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