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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N52 Exhaust Help (Headers + ?)



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      08-06-2018, 03:41 PM   #89
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Originally Posted by FlaPatsFan View Post
Interesting points guys. I will prob take my car to my exhaust guy and see what he suggests. Iíll wait a week or so then go to him. I may do what BB has and put the stock resonator back in instead of the secondary cats.
If itís helpful in your decision process I can take more audio of mine or if you are ever down in WPB area you can take it for a ride and see how you like it. It sucks to pay money to have something installed and then not like it.
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      08-06-2018, 04:00 PM   #90
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Originally Posted by Biginboca View Post
If itís helpful in your decision process I can take more audio of mine or if you are ever down in WPB area you can take it for a ride and see how you like it. It sucks to pay money to have something installed and then not like it.
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      08-06-2018, 04:47 PM   #91
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Originally Posted by Taskmaster View Post
No, and also no.

It's not muffling sounds at all, the noise reduction is mostly a result of the exhaust gas merger (Y pipe)

Resonator's don't quiet exhausts - they CAN, but that's not their job and they shouldn't be used for that purpose.
This guy...

OK, so how do you explain this?

Quote:
Originally Posted by MotorenWerkeN52 View Post
I put the OEM resonator back with the PE muffler and man did it sound perfect. It was a bit quiter compared to just the PE without headers but in high rpms it was gold.

I miss that sound... Now I have everything stock after the headers and there is no noise at all, basically sounds stock.
According to MotorenWerkeN52, PE muffler (no OE resonator) + stock headers is LOUDER than PE + OE Resonator + aftermarket headers.

If aftermarket headers are so loud, and the OE resonator isn't cancelling any more noise than the PE's y-pipe, how do you explain what's happening there?

I'm not saying that a resonators 'job' is to attenuate an exhaust system's overall noise-level (however it is certainly it's job to attenuate the noise at a certain frequency which I would argue obviously attenuates sound overall, at least to some degree...), but I think the real confusion here is stemming from the fact that our OE resonator isn't JUST a resonator. We just call it that. And because of what it really is - a y-merger built into a chamber that also has resonating properties as well as what I personally believe to be MUFFLING properties - I feel, at least at this point (with very limited data), that the OE "resonator" does quieten the exhaust more than an aftermarket resonator does. Regardless, we need more people to experiment and record objective data (i.e. SPL meter) to ever really know for sure. That's my opinion on the matter though and I am sticking to it until proven wrong.
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      08-06-2018, 05:14 PM   #92
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Quote:
Originally Posted by atmosphericM View Post
This guy...

OK, so how do you explain this?



According to MotorenWerkeN52, PE muffler (no OE resonator) + stock headers is LOUDER than PE + OE Resonator + aftermarket headers.

If aftermarket headers are so loud, and the OE resonator isn't cancelling any more noise than the PE's y-pipe, how do you explain what's happening there?

I'm not saying that a resonators 'job' is to attenuate an exhaust system's overall noise-level (however it is certainly it's job to attenuate the noise at a certain frequency which I would argue obviously attenuates sound overall, at least to some degree...), but I think the real confusion here is stemming from the fact that our OE resonator isn't JUST a resonator. We just call it that. And because of what it really is - a y-merger built into a chamber that also has resonating properties as well as what I personally believe to be MUFFLING properties - I feel, at least at this point (with very limited data), that the OE "resonator" does quieten the exhaust more than an aftermarket resonator does. Regardless, we need more people to experiment and record objective data (i.e. SPL meter) to ever really know for sure. That's my opinion on the matter though and I am sticking to it until proven wrong.
Not worth me arguing over. People will do what they want.
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      08-06-2018, 05:31 PM   #93
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I was actually curious and just did a little research and, lo and behold, the E9x "resonator" is actually called the "center muffler" on parts diagrams, literature, etc.

So there you go.

It isn't a resonator. It muffles and makes the exhaust quieter.

Now to get the PSA out there so that everyone in the E9x scene stops calling it a resonator. (lol, yeah, right...)
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      08-06-2018, 05:34 PM   #94
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Quote:
Originally Posted by atmosphericM View Post
I was actually curious and just did a little research and, lo and behold, the E9x "resonator" is actually called the "center muffler" on parts diagrams, literature, etc.

So there you go.

It isn't a resonator. It muffles and makes the exhaust quieter.

Now to get the PSA out there so that everyone in the E9x scene stops calling it a resonator. (lol, yeah, right...)
I was doing the same:

https://www.realoem.com/bmw/enUS/sho...diagId=18_0611

I got curious about it because the 1 series doesn't come with secondaries like the E90 does - and the one series PE does remove the "center muffler"
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      08-06-2018, 06:48 PM   #95
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Quote:
Originally Posted by FlaPatsFan View Post
Interesting points guys. I will prob take my car to my exhaust guy and see what he suggests. Iíll wait a week or so then go to him. I may do what BB has and put the stock resonator back in instead of the secondary cats.
Put the stock resonator back in, it makes a huge difference. At least it did for me.
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      08-06-2018, 11:21 PM   #96
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Originally Posted by Biginboca View Post
If itís helpful in your decision process I can take more audio of mine or if you are ever down in WPB area you can take it for a ride and see how you like it. It sucks to pay money to have something installed and then not like it.
Thanks BB I may take you up on that. I have family in Hollywood near the Casino and a good buddy in W. Palm. I am overdue for a visit over there. I will shoot you a pm.

As for my set up....donít get me wrong it sounds great but it is loud. It definitely has a serious race quality to it. Iím not one to have an obnoxious exhaust but some ppl may view it that way. Not that I care, Iím more concerned with not waking up my 1yo when heís sleeping. Lol
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      08-06-2018, 11:50 PM   #97
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I got AA headers and a muffler delete. Inside the cabin (with the rear seats UP) the volume is quite nice. It does drone a bit on the highway, but it's on the level of noise with the wind and tires, not bad but definitely there. Keep in mind I'm around 3.5k@80mph with the 3.73 rear. Above 4.5k the rasp intensifies greatly. Downshifts are pretty loud, and there is rasp on decel from higher RPMs. Nothing bone rattling. You can make it quiet but as soon as you get anywhere near the throttle, the noise increases pretty linearly. It's appropriate for a car guy, but even this is right at the threshold for me - but I'm trying to balance this car as the ultimate daily that is for car guys and lightly trackable.

I'm looking into a small muffler I can add inline. I think the exhaust is 2.25" by where the stock muffler is. I love the sound but just want a slight reduction, not as much reduced as was described with the stock setup+AA headers. Suggestions?

Taskmaster 1 series indeed can come with secondary cats. Mine has em, and I have zero intentions of removing them.

I think it goes something like this
Federal legal: No secondaries
ULEV: Secondaries
SULEV: N51
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      08-07-2018, 08:46 AM   #98
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      08-07-2018, 10:53 AM   #99
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Originally Posted by desertman123 View Post
I'm looking into a small muffler I can add inline. I think the exhaust is 2.25" by where the stock muffler is. I love the sound but just want a slight reduction, not as much reduced as was described with the stock setup+AA headers. Suggestions?
How about the "PE Mod?" Do you still have your stock muffler? Or better yet, I want to say there is a guy selling a used AA muffler in Florida right now. I feel like any aftermarket muffler will fit the bill, or are you worried about it getting too quiet? If it does, you could always compensate by deleting the secondaries which certainly frees up some power, too (if tuned properly).

Curious, does the 128i have a center muffler? All the same components as the 3er (catted headers, catted front pipes (secondaries), center muffler/y-pipe, rear muffler)?
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      08-07-2018, 11:01 AM   #100
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Originally Posted by desertman123 View Post
I got AA headers and a muffler delete. Inside the cabin (with the rear seats UP) the volume is quite nice. It does drone a bit on the highway, but it's on the level of noise with the wind and tires, not bad but definitely there. Keep in mind I'm around 3.5k@80mph with the 3.73 rear.
I find it interesting, but my PE definitely 'drones' a little (w/ stock headers and secondaries). About as much as what you're describing. It's definitely there. But what is drone? It's just exhaust noise. I feel like it's probably impossible to have an exhaust that you can hear without it ever 'droning.'

That's one reason that I'm even more excited about going to the 3.73 rear end, though. Bumping up the revs should eliminate that tiny bit of drone I have. I bet if you were on your stock rear end, your droning would be worse for sure.

It sure is fun thinking about exhausts, and cars in general - and trying to essentially reverse-engineer what the guys at BMW did.
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      08-07-2018, 12:59 PM   #101
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Quote:
Originally Posted by atmosphericM View Post
How about the "PE Mod?" Do you still have your stock muffler? Or better yet, I want to say there is a guy selling a used AA muffler in Florida right now. I feel like any aftermarket muffler will fit the bill, or are you worried about it getting too quiet? If it does, you could always compensate by deleting the secondaries which certainly frees up some power, too (if tuned properly).

Curious, does the 128i have a center muffler? All the same components as the 3er (catted headers, catted front pipes (secondaries), center muffler/y-pipe, rear muffler)?
Yep, I still got my stock one sitting in my parent's attic. That might be a good solution. Will have to get my nice pretty tips welded up to it though!

I'm worried about it being TOO quiet. I was thinking the stock muffler would do that, but an aftermarket, straight-thru muffler would be a good middle ground.

And yes the 128i has a center muffler, I'm pretty sure the exhaust is identical besides length and shape.


Oh I forgot to mention my exhaust pops and cracks like I have a burble tune, especially when it's cold. Around 3k RPM if I let off, or tap the gas lightly it goes POP POP POP. Sometimes when I shift there'll be a pop inbetween gears. Sounds good lol.
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      08-18-2018, 11:23 AM   #102
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Will do, I havenít driven it to much yet. But will be heading up to Tampa on Wednesday to get the AA re-tune.

Yes we have almost the same set up. However I replaced the factory resonator with a smaller custom one. Not sure if that will make that much of a difference tho. I must say car is pulling much better thru the mid range RPMs now!
So Iím curious now that some time has passed... what did you end up doing and are you happy with it now?
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      09-12-2018, 08:12 AM   #103
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So Iím curious now that some time has passed... what did you end up doing and are you happy with it now?
So I had the retune done and no doubt about it the car was pulling much stronger thru the mid range RPMs. Sound was loud! Especially down shifting at low RPMs. Car ran great for a week or so. Unfortunately it developed a vacuum leak in the rear crank case. Fíd up everything. PCV failure and vacuum pump failure. Car was at shop 3weeks! Just got her back yesterday. Need to have retune done again because my Indy shop flashed car back to stock settings. Ughhhhhhh. So now the idle is a bit rough but, hoping the retune will iron that out. Gonna have the performance shop go over everything again just to be safe.

This has been extremely frustrating and expensive! Fingers crossed it will all workout.

Side note....I installed Euro box with K&N filter, sounds pretty sweet I must say.
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