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BMW 3-Series (E90 E92) Forum
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Will removing secondary cats cause the car to smoke?
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10-02-2021, 05:19 PM | #1 |
Second Lieutenant
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Will removing secondary cats cause the car to smoke?
I have catless DP's and bought Vibrant resonators to clean up to the sound. But I was curious if removing the secondary cats to put the resonators would cause smoking or exhaust fumes from my car. I live in SF California and last thing I need is a cop pulling me over and sending me straight to inspection.
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10-03-2021, 12:01 PM | #3 |
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10-03-2021, 10:49 PM | #4 |
Brigadier General
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Yes. The secondaries still do a lot to keep the smell at bay. My n54 with catless downpipes is not particularly noticeable whereas my old n55 with no cats smelled like a go kart track
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10-04-2021, 06:49 AM | #5 |
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I get no smell and I am fully catless but I run full E85.
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2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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10-04-2021, 11:03 AM | #6 |
Second Lieutenant
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I really want to go the E85 route as well. But I'm not sure I would always be able to get it. Question- can your fuel system adjust to pump gas if you can't get E85? Would you also have to change tunes at the gas station?
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10-04-2021, 11:58 AM | #7 | |
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Quote:
You can do a flex tune that can very from say E10 to E60. If you can get it and your fuel system can handle it, I highly recommend running at least an E30 tune. More power and less timing corrections means the motor is running more efficient.
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2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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