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BMW 3-Series (E90 E92) Forum
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N54 335i Secondary Catalytic Converter Options
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01-18-2014, 10:48 PM | #23 | |
Master Gunner
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But it's not just about performance: for me, the sound quality is equally, if not more important, which is why I emphasized "performance AND mellow-yet-sportive sound" in my original post. Sure, I can do what you recommend by sticking with the stock 335i mufflers and simply switching to High Flow Catalytic converters but I already know I don't like the sound of catless DPs on an otherwise stock 335i exhaust; otherwise I wouldn't be posting my question, which is really about solutions for catalytic converters on aftermarket exhausts (I definitely did NOT want to pose a "which is the best exhaust" ad nauseum thread). I certainly don't want loud and obnoxious either. So it's a compromise and balance. One thing not mentioned is the weight savings by going to a full aftermarket exhaust and would be a nice benefit to aim for. The ultimate arbiter in all this for me will be price points, because if a pair of mufflers will cost me $1.5k, that's in the ballpark of full-on exhaust systems and would sway me to the latter. Though, taking a cue from your suggestion of using HFC's, I think if I couple that with a pair of 335is mufflers, worst case scenario of having to buy them brand new for ~$700 for a set, that might be a viable option. Did I say I like them sounds of the 335is muffs? After some digging, best I can find is $1,500 plus shipping. Would like to know where you got yours for $1,200. But the majority (not everyone) agrees the 335is exhaust sounds "better" so I think my worst-case solution mentioned above of sticking with a BMW exhaust by switching to 335is mufflers plus high-flow cats would still keep me below even a $1,200 price point; perhaps sub-$1,000 if I do all the work myself (have my own MIG welder or can resort to exhaust band clamps for the quick-n-dirty).
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2008 335i Alpine White Sport Sedan AT | Avant Garde M364 Staggered 19"
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01-18-2014, 10:58 PM | #24 |
Master Gunner
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One thing I failed to mention: I need to switch back to an all stock exhaust every two years to pass the Smog man here in Cali. Which means if I modify the stock secondary cats in any way instead of going full aftermarket, I have to make it reversible.
I'm already prepared to switch out DPs back and forth and will be keeping my stock DPs in storage, along with my stock exhaust in whatever form I ultimately decide upon for my "everyday" exhaust.
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2008 335i Alpine White Sport Sedan AT | Avant Garde M364 Staggered 19"
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01-20-2014, 07:30 PM | #25 | |
Stupid Idiot
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08-09-2020, 03:10 PM | #26 | |
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love the sound
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08-11-2020, 12:20 AM | #27 |
Davy Jones, Giant Squid
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Thread was from 6 years ago....poster you commented on hasn't been online in 1 1/2 years
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2010 e90 335i LCI - xHP - Mishimoto - BMS - CPe - Turbosmart - MHD - Eibach - Koni - VMR - LUX
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08-13-2020, 07:00 AM | #28 | |
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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08-13-2020, 09:37 AM | #30 |
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You should get your nose checked. There's definitely a stench...even when running a healthy dose of E85. On straight pump, it's 2x worse.
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08-13-2020, 09:49 AM | #31 |
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I sure haven't noticed anything......but I'm not constantly sniffing my exhaust either. It's exhaust.....it's not supposed to smell "good"
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08-13-2020, 12:55 PM | #33 | |
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Worrying about how your exhaust smells makes about as much sense as worrying about what your brake pads smell like when they get hot.
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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