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2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning Catted Downpipe + Non-Resonated Catback

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      06-17-2020, 12:10 PM   #23
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Quote:
Originally Posted by WolfGTI View Post
Now I have the AA catted dp with the resonated Remus. It's got good volume and tone without being conspicuous.

I previously had the AWE with the AA dp and it sounded awesome, but was too loud with cold start and in continuous driving, but under WOT and when downshifting it was glorious.
Probably the safest bet to go with resonated and catted downpipe combo. Unfortunately I already have the non resonated system
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      06-19-2020, 02:40 PM   #24
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Well it's installed! It was more of a pain than expected, two Canadian winters had the downpipe and midpipe hopelessly stuck. Ended up having to remove the entire exhaust with the downpipe still attached to get them separated. At that point a sledge and a block of wood make quick work of it.

First the bad news - the cold start is extremely loud. Just as bad as I expected from what I'd read beforehand. If I were to start it up late at night or early in the morning I'd be throwing it into gear immediately to cut the volume down.

The rest is all good news though. Once the cold start is done (about 20 seconds) it becomes much quieter and even more so a bit later. Idle isn't much different than before.

Driving in comfort is marginally louder, but completely reasonable. Marginally increased volume at cruising speeds. It didn't drone at all before and I don't think it is now. Even throwing the transmission into S isn't obnoxious since there are no aggressive burbles.

Sport mode though - that's when things become kind of crazy. The burbles from letting off the throttle are now cracks. Sounds great under load and WOT, it's loud but I'd say the perfect volume level. Letting off the gas at 4k RPM reliably produces one big bang which is plenty of fun. Upshifts are very aggressive.

Tl;DR - Cold start is terrible, everything else is great.
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      06-22-2020, 02:45 PM   #25
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Quote:
Originally Posted by Kobylash View Post
Well it's installed! It was more of a pain than expected, two Canadian winters had the downpipe and midpipe hopelessly stuck. Ended up having to remove the entire exhaust with the downpipe still attached to get them separated. At that point a sledge and a block of wood make quick work of it.

First the bad news - the cold start is extremely loud. Just as bad as I expected from what I'd read beforehand. If I were to start it up late at night or early in the morning I'd be throwing it into gear immediately to cut the volume down.

The rest is all good news though. Once the cold start is done (about 20 seconds) it becomes much quieter and even more so a bit later. Idle isn't much different than before.

Driving in comfort is marginally louder, but completely reasonable. Marginally increased volume at cruising speeds. It didn't drone at all before and I don't think it is now. Even throwing the transmission into S isn't obnoxious since there are no aggressive burbles.

Sport mode though - that's when things become kind of crazy. The burbles from letting off the throttle are now cracks. Sounds great under load and WOT, it's loud but I'd say the perfect volume level. Letting off the gas at 4k RPM reliably produces one big bang which is plenty of fun. Upshifts are very aggressive.

Tl;DR - Cold start is terrible, everything else is great.
Thank you for your detailed writeup! To be clear what is the full setup you are running? CG downpipe with non resonated remus catback? Thanks! I would love for the burbles to be cracks but I have to decide on if I am willing to live with the cold start without being able to tune it out.
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      06-23-2020, 10:46 AM   #26
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Quote:
Originally Posted by Kobylash View Post
Well it's installed! It was more of a pain than expected, two Canadian winters had the downpipe and midpipe hopelessly stuck. Ended up having to remove the entire exhaust with the downpipe still attached to get them separated. At that point a sledge and a block of wood make quick work of it.

First the bad news - the cold start is extremely loud. Just as bad as I expected from what I'd read beforehand. If I were to start it up late at night or early in the morning I'd be throwing it into gear immediately to cut the volume down.

The rest is all good news though. Once the cold start is done (about 20 seconds) it becomes much quieter and even more so a bit later. Idle isn't much different than before.

Driving in comfort is marginally louder, but completely reasonable. Marginally increased volume at cruising speeds. It didn't drone at all before and I don't think it is now. Even throwing the transmission into S isn't obnoxious since there are no aggressive burbles.

Sport mode though - that's when things become kind of crazy. The burbles from letting off the throttle are now cracks. Sounds great under load and WOT, it's loud but I'd say the perfect volume level. Letting off the gas at 4k RPM reliably produces one big bang which is plenty of fun. Upshifts are very aggressive.

Tl;DR - Cold start is terrible, everything else is great.
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      07-08-2020, 12:12 PM   #27
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Quote:
Originally Posted by kianf22 View Post
Thank you for your detailed writeup! To be clear what is the full setup you are running? CG downpipe with non resonated remus catback? Thanks! I would love for the burbles to be cracks but I have to decide on if I am willing to live with the cold start without being able to tune it out.
Correct, the full setup is an VRSF catless downpipe and Remus non-resonated exhaust.

Having had it installed for a couple weeks now I think I can live with the cold start. If I'm trying to be quiet I'll just throw it into drive, or apply a bit of throttle which makes it even quieter until the cold start window has passed.
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      07-08-2020, 03:22 PM   #28
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Very interesting.

I'm considering the opposite; catless with a resonated Remus.
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      07-30-2020, 06:54 PM   #29
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Quote:
Originally Posted by Two4me View Post
Very interesting.

I'm considering the opposite; catless with a resonated Remus.
I'm sure that would sound great. I need catted to avoid the cel so catted and non res for me!
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      07-31-2020, 03:57 PM   #30
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Welp. Thought that opening this thread would give me a better idea of what to expect but doesn't seem like there's many running this configuration. Just ordered the AA catted downpipe and will update when it arrives and I get it installed!
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      10-23-2020, 10:24 AM   #31
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Thought I'd post a small update here. After a couple months I've decided that I can't live with the cold start. I noticed I was beginning to dread firing up the car both on my driveway and when I was out and about, it just sounded too terrible.

I considered going back to the stock down pipe or buying the resonated mid pipe but went the other way instead - swapped the JB4 out for BM3. No more cold start and I'm so much happier, should have just gone this way on day 1. Only reason I didn't was warranty but I've come to the conclusion that if something catastrophic happens BMW will certainly know the JB4 was installed, so why not go the (in my opinion) better route and flash?
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      10-24-2020, 03:02 PM   #32
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Quote:
Originally Posted by Kobylash View Post
Thought I'd post a small update here. After a couple months I've decided that I can't live with the cold start. I noticed I was beginning to dread firing up the car both on my driveway and when I was out and about, it just sounded too terrible.

I considered going back to the stock down pipe or buying the resonated mid pipe but went the other way instead - swapped the JB4 out for BM3. No more cold start and I'm so much happier, should have just gone this way on day 1. Only reason I didn't was warranty but I've come to the conclusion that if something catastrophic happens BMW will certainly know the JB4 was installed, so why not go the (in my opinion) better route and flash?
This is interesting to hear. I'm in the same boat with warranty. Was thinking of going jb4 honestly. My understanding is that flash and piggy are both detectable but a flash is MORE detectable. i.e. they would have to do some more digging to find the jb4 whereas flash would be instantly detected. Is this true? I've been debating between keep it stock, piggy, and flash for some time now.

Also sorry to hear you couldn't live with the cold start. It is pretty loud with the non resonated midpipe but imo sounds rly good and I haven't gotten any complaints from my older neighbors and I live in the suburbs lol. I will admit there is sometimes some vibrating at certain rpms but It's not annoying enough for me to call it drone and the way it sounds all other times makes up for it.

Is it safe to turn off cold start on a catted downpipe? Isn't the cold start needed to warm the cat?
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      10-27-2020, 08:12 AM   #33
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Quote:
Originally Posted by kianf22 View Post
This is interesting to hear. I'm in the same boat with warranty. Was thinking of going jb4 honestly. My understanding is that flash and piggy are both detectable but a flash is MORE detectable. i.e. they would have to do some more digging to find the jb4 whereas flash would be instantly detected. Is this true? I've been debating between keep it stock, piggy, and flash for some time now.

Also sorry to hear you couldn't live with the cold start. It is pretty loud with the non resonated midpipe but imo sounds rly good and I haven't gotten any complaints from my older neighbors and I live in the suburbs lol. I will admit there is sometimes some vibrating at certain rpms but It's not annoying enough for me to call it drone and the way it sounds all other times makes up for it.

Is it safe to turn off cold start on a catted downpipe? Isn't the cold start needed to warm the cat?
That is my understanding regarding warranty as well, flash is easily (if not instantly) detectable even if you re-lock the DME. JB4 requires a bit more digging. My thinking is that anything worth worrying about replacing under warranty would be something BMW would do that extra digging for anyway, so the result would be the same.

Maybe your catted downpipe muffles the cold start just enough to make it livable which is good to know. I'm very happy with the sound and volume level any other time but the cold start, it's more than quiet enough when cruising and roars when you go WOT. I agree there is some drone when under light load like going up an incline on the highway but it's not enough to bother me (and I am picky).

I'm no expert by any means but my understanding is that the cold start heats the cat for emissions only as the cat is not effective until it reaches operating temp, so I can't see why turning it off would hurt anything.
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      10-29-2020, 01:28 PM   #34
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Quote:
Originally Posted by Kobylash View Post
Quote:
Originally Posted by kianf22 View Post
This is interesting to hear. I'm in the same boat with warranty. Was thinking of going jb4 honestly. My understanding is that flash and piggy are both detectable but a flash is MORE detectable. i.e. they would have to do some more digging to find the jb4 whereas flash would be instantly detected. Is this true? I've been debating between keep it stock, piggy, and flash for some time now.

Also sorry to hear you couldn't live with the cold start. It is pretty loud with the non resonated midpipe but imo sounds rly good and I haven't gotten any complaints from my older neighbors and I live in the suburbs lol. I will admit there is sometimes some vibrating at certain rpms but It's not annoying enough for me to call it drone and the way it sounds all other times makes up for it.

Is it safe to turn off cold start on a catted downpipe? Isn't the cold start needed to warm the cat?
That is my understanding regarding warranty as well, flash is easily (if not instantly) detectable even if you re-lock the DME. JB4 requires a bit more digging. My thinking is that anything worth worrying about replacing under warranty would be something BMW would do that extra digging for anyway, so the result would be the same.

Maybe your catted downpipe muffles the cold start just enough to make it livable which is good to know. I'm very happy with the sound and volume level any other time but the cold start, it's more than quiet enough when cruising and roars when you go WOT. I agree there is some drone when under light load like going up an incline on the highway but it's not enough to bother me (and I am picky).

I'm no expert by any means but my understanding is that the cold start heats the cat for emissions only as the cat is not effective until it reaches operating temp, so I can't see why turning it off would hurt anything.
Thanks for your response, I've had the same thoughts while debating what to do with my car. I just wonder if there's any risk to damaging the cat if you turn off the cold start, especially if you run burbles. im not sure if the cat heating is just for emissions reasons. but i would assume putting your car in sport with all the pops and bangs would damage a cold cat, no?
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