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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 06-09-2013, 10:58 PM   #1
morningisbad
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Catless in a vert?

I've been contemplating swapping my headers for some super sprint ones and leaving my stock section 1 (I also have non-res SS x-pipe and SS race). My concern is the smell in a vert. I've heard very mixed reviews on this. Some saying it's not bad and others saying it's unbearable. Anyone have experience with a similar situation and feel like sharing?
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Old 06-10-2013, 12:51 AM   #2
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I'm curious to know this as well!
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Old 06-10-2013, 01:44 AM   #3
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Catless in a vert?

You'll always smell it when stopped. Not sure how bad it actually is in the e46 but I know you'll always smell it. Won't smell it when moving though. If you have money for super sprints just have some high flow cats welded in. Shouldn't be too much more in cost.
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Old 06-10-2013, 02:02 AM   #4
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I would get a set of race cats and not worry about it. Otherwise the car will give you a headache after a while
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Old 06-10-2013, 04:42 AM   #5
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i have AA catless race headers. The smell is tolerable when static. Being a car fanatic, i actually enjoy the smell.
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Old 06-10-2013, 02:08 PM   #6
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Re: Catless in a vert?

Quote:
Originally Posted by peytonracer4 View Post
You'll always smell it when stopped. Not sure how bad it actually is in the e46 but I know you'll always smell it. Won't smell it when moving though. If you have money for super sprints just have some high flow cats welded in. Shouldn't be too much more in cost.

This is where I'm leaning...


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i have AA catless race headers. The smell is tolerable when static. Being a car fanatic, i actually enjoy the smell.
I feel the same way! But I'm less concerned about me and more concerned about the ladies :cool: No, but seriously...my fiance wouldn't let me take the top down if it was too bad.
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Old 06-10-2013, 02:14 PM   #7
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Catless in a vert?

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This is where I'm leaning...




I feel the same way! But I'm less concerned about me and more concerned about the ladies :cool: No, but seriously...my fiance wouldn't let me take the top down if it was too bad.
You actually smell it just as much with the top up in my experience.
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Old 06-10-2013, 02:43 PM   #8
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You actually smell it just as much with the top up in my experience.
Hmm...I wouldn't have expected this. I'm thinking I'd have to add cats in order to keep her happy.
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Old 06-11-2013, 09:18 PM   #9
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I'm curious to know this as well!
Dude, where did you get that trunk? Gotta have one!
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Old 06-20-2013, 12:26 AM   #10
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Dude, where did you get that trunk? Gotta have one!
its a tekarbon trunk
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Old 06-20-2013, 01:30 AM   #11
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The concern should be the check engine light lol and then the ridiculous smell you'll be receiving.
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Old 06-23-2013, 11:43 PM   #12
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i run cattles on mine. so when you drive there is no smell but when you stop its smells bad.when the top on its not bad at all,little smell but nothing to worry about.
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Old 06-23-2013, 11:44 PM   #13
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and w0W your car looks sick
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Old 09-16-2013, 12:09 PM   #14
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As an update to this, just bought V1 Super Sprint headers and catless section one! I'll post an update on the smell once I get everything installed.
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Old 10-03-2013, 11:23 AM   #15
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I got the super sprint headers installed yesterday. Occasionally you catch a whiff of the smell, but its not bad at all, and its not an ever present issue. Sounds amazing though

My setup:
K&N intake
Super Sprint V1 stepped headers
SS s-pipe (resonators added)
SS x-pipe (non-resonated)
SS race muffler
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Old 10-03-2013, 01:27 PM   #16
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Catless in a vert?

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The concern should be the check engine light lol and then the ridiculous smell you'll be receiving.
This is why I have not put on my headers yet. Lol other then catted section 1 or a evolve tune what's another way around the check engine light?


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Old 10-03-2013, 01:54 PM   #17
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This is why I have not put on my headers yet. Lol other then catted section 1 or a evolve tune what's another way around the check engine light?
I think just about anyone can take care of the check engine light for you with a tune. My ESS tune came in the mail yesterday, got them the readouts and HOPEFULLY I'll have a customized tune ready to go today!

But there are a few other ways to get around the issue. I'm pretty sure there is a good sized thread about options. One is an O2 sim, but as far as I know, they're sketchy at best, support is almost non-existent. You can also (and forgive me if I'm saying all of this wrong) use a sparkplug non-fouler to put extra distance between your existing O2 sensor and the flow. The added distance makes the O2 sensor read lower, which can avoid the SES. The non-fouler is pretty cheap if I remember correctly. I never looked too deeply into either of these options though. Figured if I was going to do it, I should do it right and get a tune.

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Old 10-03-2013, 02:38 PM   #18
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Catless in a vert?

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Originally Posted by morningisbad View Post
I think just about anyone can take care of the check engine light for you with a tune. My ESS tune came in the mail yesterday, got them the readouts and HOPEFULLY I'll have a customized tune ready to go today!

But there are a few other ways to get around the issue. I'm pretty sure there is a good sized thread about options. One is an O2 sim, but as far as I know, they're sketchy at best, support is almost non-existent. You can also (and forgive me if I'm saying all of this wrong) use a sparkplug non-fouler to put extra distance between your existing O2 sensor and the flow. The added distance makes the O2 sensor read lower, which can avoid the SES. The non-fouler is pretty cheap if I remember correctly. I never looked too deeply into either of these options though. Figured if I was going to do it, I should do it right and get a tune.

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[/QUOTE]

Ok thanks for the info. I plan on getting a tune but that will be after I get a csl airbox. Don't want to get a tune twice


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Old 10-03-2013, 03:00 PM   #19
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Ok thanks for the info. I plan on getting a tune but that will be after I get a csl airbox. Don't want to get a tune twice


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Good call

I know I talked to ESS about a retune because I'm hoping their supercharger is in my future, and they said they do a $300 discount on the supercharger because you've already got a tune through them. Basically giving you half back from your initial tune. Not sure how that would go going from a standard tune to an alpha-n one though?
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Old 10-04-2013, 06:35 AM   #20
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Re: Catless in a vert?

I'm running catless with afe race headers, I don't smell gas anymore..I think I'm immune to the scent now. Pick up some 02 simulators or check out some alternatives on YouTube, that will solve ur ses light

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