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      10-01-2012, 01:47 AM   #1
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2007 335i  [2.62]
Exhaust too loud to taste

Since I installed catless downpipes (stock secondary cats, resonator, and muffler), the exhaust is very loud.
Any suggestion/modification on how to suppress the exhaust noise?
Thank you.
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      10-01-2012, 01:54 AM   #2
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try putting the stock downpipes on
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      10-01-2012, 01:59 AM   #3
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too loud to taste? That just sounds funny. LOL.

Also, if you think your exhaust is loud with just catless DP's might as well put back on your stock cats. You can always try the golf tee mod or do a muffler delete.
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      10-01-2012, 03:35 AM   #4
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This is really strange. I know someone with an identical setup and the sound is almost stock-like. Maybe your downpipe gaskets are worn and there is a leak ? Or maybe the V-Bands at the turbo exists are not properly seated ? If these are ok, one option is to weld some extra resonators on the midpipes. However, there is no room for standard resonators if you still have the stock secondary cats, so you must use bullet-style resonators. Like this one but it has 3" in/out, you must find some with 2.25"-2.5" pipe:

http://vibrantperformance.com/catalo...roducts_id=271
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      10-01-2012, 03:39 AM   #5
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can you not put the stock dps back on?!?
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      10-01-2012, 08:06 AM   #6
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put muffler back on, for ultimate noise suppression.
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      10-01-2012, 08:20 AM   #7
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if you're saying what I think your saying, this is the same set up I am running and it sounds perfect.

Again, c@tless DPs, stock secondaries, stock resonator and stock mufflers.

Now if your car is an E92 it does not have a resonator, just an X pipe. E92's will be louder with this same setup
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      10-01-2012, 09:41 AM   #8
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If you think just a set of DP's are too loud, then you don't need to mod the exhaust at all. Put the stock DPs back on. I can't imagine you thinking its too loud though. I wonder if something else is going on.
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      10-01-2012, 10:58 AM   #9
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Quote:
Originally Posted by secretsquirrel View Post
. I can't imagine you thinking its too loud though. I wonder if something else is going on.
this.
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      11-20-2012, 11:31 AM   #10
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I would like to add to this as well...

I have an e92 with the BMW performance exhaust, man it sounded great UNTIL I put the AR catless DPs on. Yes, I hear more turbo but I'm almost embarrassed to get on it because it sounds like a Honda civic with a fart pipe. I am so completely unhappy with the sound that I've consider its not worth the extra power.

After doing some research, it sounds like I have an issue...
I thought that maybe there was a leak in the DPs connections but it sounds like its coming from the rear of the car (from the drivers seat of course). It's a high pitch rasp sound, sort of like my old E46 M3 rasp when cold but 3X.

My first turbo car, but I was definitely expecting a more throaty noise. Instead I get all exhaust which drowns out any turbo noise. It sounds like everyone else loves the sound, I can only imagine something is wrong in my situation.

Not sure what I'm asking the community but does this sound normal??? No pun intended.

BTW, I got 2009 e92... JB4 (map 2), DCI and of course the catless DPs.
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      11-20-2012, 11:36 AM   #11
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Can you take a video? That can help us determine if the sound is normal or if something else is going on.

If everything is normal and downpipes are too loud for you, I would put your stock downpipes back on, do the actuator mod and maybe delete the secondary cats.
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      11-20-2012, 01:23 PM   #12
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catless downpipes will make your exhaust louder for sure. high power usually means loud. look at any high performance car, they are all loud.
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      11-20-2012, 01:36 PM   #13
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Quote:
Originally Posted by e92SCguy View Post
I would like to add to this as well...

I have an e92 with the BMW performance exhaust, man it sounded great UNTIL I put the AR catless DPs on. Yes, I hear more turbo but I'm almost embarrassed to get on it because it sounds like a Honda civic with a fart pipe. I am so completely unhappy with the sound that I've consider its not worth the extra power.

After doing some research, it sounds like I have an issue...
I thought that maybe there was a leak in the DPs connections but it sounds like its coming from the rear of the car (from the drivers seat of course). It's a high pitch rasp sound, sort of like my old E46 M3 rasp when cold but 3X.

My first turbo car, but I was definitely expecting a more throaty noise. Instead I get all exhaust which drowns out any turbo noise. It sounds like everyone else loves the sound, I can only imagine something is wrong in my situation.

Not sure what I'm asking the community but does this sound normal??? No pun intended.

BTW, I got 2009 e92... JB4 (map 2), DCI and of course the catless DPs.

Why are you running map 2? Switch it to map 5 (auto tune) you'll be so much happier. (make sure to update your jb4 to the current software). If you have access to E85 put 4 or 5 gallons in with a full tank of 93
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      11-20-2012, 01:46 PM   #14
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Quote:
Originally Posted by e60oholic View Post
Why are you running map 2? Switch it to map 5 (auto tune) you'll be so much happier. (make sure to update your jb4 to the current software). If you have access to E85 put 4 or 5 gallons in with a full tank of 93
Yea I need to update the JB4, that's why... but I should get on that!
-------------------
I'll make an acceleration video and even a cold crank one... I feel like a jack@ss to my neighbors every morning.

Thanks guys!
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      11-20-2012, 05:34 PM   #15
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FWIW I have an e92 with CL DPs, stock midpipes with secondaries and stock mufflers with dimisa tips. I use the JB4 to keep the exhaust fully open and on a cold start in my garage I had my neighbors 5 houses down talk about waking up to my exhaust in the morning when I go to work. Its pretty loud but once its warm its quieter, I like it a lot and don't plan on changing anything except for maybe 100CEL secondaries down the road.
Side note, on a cold start it revs to a hair under 2000rpm before settling down a bit... This a symptom of O2 sensors or something? Or just normal?
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      11-20-2012, 05:43 PM   #16
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Quote:
Originally Posted by nailer335 View Post
FWIW I have an e92 with CL DPs, stock midpipes with secondaries and stock mufflers with dimisa tips. I use the JB4 to keep the exhaust fully open and on a cold start in my garage I had my neighbors 5 houses down talk about waking up to my exhaust in the morning when I go to work. Its pretty loud but once its warm its quieter, I like it a lot and don't plan on changing anything except for maybe 100CEL secondaries down the road.
Side note, on a cold start it revs to a hair under 2000rpm before settling down a bit... This a symptom of O2 sensors or something? Or just normal?
Sounds normal as long as it eventually settles to ~700rpm. How's the rasp with your setup?
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      11-20-2012, 05:46 PM   #17
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exhaust too loud to taste chicken too drunk to taste

is this Jedi language?
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      11-20-2012, 05:58 PM   #18
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Quote:
Originally Posted by nitehawk
Quote:
Originally Posted by nailer335 View Post
FWIW I have an e92 with CL DPs, stock midpipes with secondaries and stock mufflers with dimisa tips. I use the JB4 to keep the exhaust fully open and on a cold start in my garage I had my neighbors 5 houses down talk about waking up to my exhaust in the morning when I go to work. Its pretty loud but once its warm its quieter, I like it a lot and don't plan on changing anything except for maybe 100CEL secondaries down the road.
Side note, on a cold start it revs to a hair under 2000rpm before settling down a bit... This a symptom of O2 sensors or something? Or just normal?
Sounds normal as long as it eventually settles to ~700rpm. How's the rasp with your setup?
Its slowly getting worse. Like the transmission. And the LPFP or it's sensor...

I'm pretty sure the secondary cats are shot. I like the tone of the exhaust under normal cruising and lower loads more than WOT to be honest. It has great tone below 4k at less than 75% throttle. Especially love between 2500-3000rpm in DS.
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      11-20-2012, 06:47 PM   #19
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      11-20-2012, 06:58 PM   #20
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Thats why I didn't want to go cattless and settled for highflow catts instead.
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      11-20-2012, 07:24 PM   #21
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Quote:
Originally Posted by HighPSI View Post
catless downpipes will make your exhaust louder for sure. high power usually means loud. look at any high performance car, they are all loud.
Veyron? Lol
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      11-21-2012, 12:56 AM   #22
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Rasping exhaust

I have PE on my car but with Procede + I have catted DP's. I had a similar issue [failed a trackday noise limit test] when running boosted maps. On stock map it was fine. Played around with WG position setting and this helped a lot with tone & volume of the exhaust. Last visit to same track, passed the noise test with boosted maps. I have no experience of JB4 but I assume you can do the same with it.


Quote:
Originally Posted by e92SCguy View Post
I would like to add to this as well...

I have an e92 with the BMW performance exhaust, man it sounded great UNTIL I put the AR catless DPs on. Yes, I hear more turbo but I'm almost embarrassed to get on it because it sounds like a Honda civic with a fart pipe. I am so completely unhappy with the sound that I've consider its not worth the extra power.

After doing some research, it sounds like I have an issue...
I thought that maybe there was a leak in the DPs connections but it sounds like its coming from the rear of the car (from the drivers seat of course). It's a high pitch rasp sound, sort of like my old E46 M3 rasp when cold but 3X.

My first turbo car, but I was definitely expecting a more throaty noise. Instead I get all exhaust which drowns out any turbo noise. It sounds like everyone else loves the sound, I can only imagine something is wrong in my situation.

Not sure what I'm asking the community but does this sound normal??? No pun intended.

BTW, I got 2009 e92... JB4 (map 2), DCI and of course the catless DPs.
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