[E91 M Sport]

Originally Posted by Needbmwpartzz

That is one theory(assuming red bum character pulling undies down means crap)

I was going for @ss but crap will work

[Ali-E90]

Originally Posted by TheAxiom

Or....a Borla XS muffler is 100 bucks welded at a shop, ia lighter and can free up some power.

Any idea if this is a good sounding option?
So hard to tell from YouTube videos, and too many have modified exhausts that don't sound nice

[kuba330i]

Looking forward to results.

The Porsche community does this to many OEM mufflers as well.

[Taskmaster]

Originally Posted by Ali-323i

Any idea if this is a good sounding option?
So hard to tell from YouTube videos, and too many have modified exhausts that don't sound nice

It is. I don't know what vids you saw though.

[JuniorB]

We all know now that removing that muffler is in the top three must haves on the list of mods. I'm surprised after seeing this,we should all be hacking them off

[NYBulldog]

Its a good idea. Similar to how the M3 mufflers are modified. Just remember how freaking heavy it is. I did a delete straight from the resonator out. Get some new tips bruhhhhh. Best of luck.

[DaanBMW]

What about all the droning I hear with the muffler delete ?

[dannyhavok]

Originally Posted by TheAxiom

It is. I don't know what vids you saw though.

Any idea where I can order one of these?

[chris82]

drop a few marbles in there and see where they come out....

+1 to buying the real PE

[JuniorB]

Hard to even image that thing flows.

[pry_vit]

In my opinion, a muffler delete is the best option. Don't waste your time and money with anything else. The sound is great, and only gets better with time. At first it's a very clean sound (almost too clean), after a few thousand miles it gets a little more raspy (not in a ricey way but just the right amount). Nobody will confuse it for a civic. It's also just loud enough to where it's not ridiculous, but at the same time you can clearly hear it, especially with the windows down. There is very minimal drone to no drone, well at least for me. The only thing that can happen is if you have anything that rattles in the back, on very low RPMs under load, you can hear vibrations of any loose plastics. I would also make sure to go to a dedicated exhaust shop. The labor itself should be $100-200 max. You can find tips online or even sometimes advance auto parts has decent ones (without any large labeling). If you are second doubting it, don't. What you can do is have them cut off the muffler and then turn the car on and rev it, once you're at this point, you will be convinced. Best mod/exhaust you can get for the money. Unless you have a grand to drop on a PE exhaust, this is the next best option, to some even better than the PE. I only get good compliments on it. Honestly, the only down side is your fuel economy will go down, not because of the muffler delete affecting it, but because you'll want to drive in second gear everywhere just so you can hear it. As James May would say, it gives you a fizzy feeling at the tip of your gentleman's parts.

[howardx]

Originally Posted by vitaliy126

In my opinion, a muffler delete is the best option. Don't waste your time and money with anything else. The sound is great, and only gets better with time. At first it's a very clean sound (almost too clean), after a few thousand miles it gets a little more raspy (not in a ricey way but just the right amount). Nobody will confuse it for a civic. It's also just loud enough to where it's not ridiculous, but at the same time you can clearly hear it, especially with the windows down. There is very minimal drone to no drone, well at least for me. The only thing that can happen is if you have anything that rattles in the back, on very low RPMs under load, you can hear vibrations of any loose plastics. I would also make sure to go to a dedicated exhaust shop. The labor itself should be $100-200 max. You can find tips online or even sometimes advance auto parts has decent ones (without any large labeling). If you are second doubting it, don't. What you can do is have them cut off the muffler and then turn the car on and rev it, once you're at this point, you will be convinced. Best mod/exhaust you can get for the money. Unless you have a grand to drop on a PE exhaust, this is the next best option, to some even better than the PE. I only get good compliments on it. Honestly, the only down side is your fuel economy will go down, not because of the muffler delete affecting it, but because you'll want to drive in second gear everywhere just so you can hear it. As James May would say, it gives you a fizzy feeling at the tip of your gentleman's parts.

Having a muffler delete right now, I can agree with you for the most part. It's loud enough to have a presence but not over bearing where it's obnoxious. However, the droning I hear while driving uphill is a bit annoying. This is why I want to modify my muffler and put it back on to achieve something closer to PE.

[pry_vit]

Originally Posted by howardx

Having a muffler delete right now, I can agree with you for the most part. It's loud enough to have a presence but not over bearing where it's obnoxious. However, the droning I hear while driving uphill is a bit annoying. This is why I want to modify my muffler and put it back on to achieve something closer to PE.

Hmmm not sure if yours is just worse or if I'm used to mine. Maybe the way the piping is welded has something to do with it? But I doubt that. The other factor of having drone probably has to do with whether you drive stick or auto. I'm sure manual drivers just go up the hill in a lower gear. I hate how my automatic feels, especially with the throttle as it doesn't downshift unless you push on it more than necessary. It always tries to stay in 6th gear, which creates drone more frequently. Getting a sprintbooster soon, wonder if that'll help

[Ali-E90]

Originally Posted by vitaliy126

Hmmm not sure if yours is just worse or if I'm used to mine. Maybe the way the piping is welded has something to do with it? But I doubt that. The other factor of having drone probably has to do with whether you drive stick or auto. I'm sure manual drivers just go up the hill in a lower gear. I hate how my automatic feels, especially with the throttle as it doesn't downshift unless you push on it more than necessary. It always tries to stay in 6th gear, which creates drone more frequently. Getting a sprintbooster soon, wonder if that'll help

Unrelated, but save your money for a tune rather than sprintbooster. All the SB does is make the car think you've pushed the pedal further than you have (something you can do with your foot without spending any money).

A tune will actually help reduce throttle lag, plug give you a better driving experience via a bit more HP and a smoother power band.

[DaanBMW]

Originally Posted by vitaliy126

In my opinion, a muffler delete is the best option. Don't waste your time and money with anything else. The sound is great, and only gets better with time. At first it's a very clean sound (almost too clean), after a few thousand miles it gets a little more raspy (not in a ricey way but just the right amount). Nobody will confuse it for a civic. It's also just loud enough to where it's not ridiculous, but at the same time you can clearly hear it, especially with the windows down. There is very minimal drone to no drone, well at least for me. The only thing that can happen is if you have anything that rattles in the back, on very low RPMs under load, you can hear vibrations of any loose plastics. I would also make sure to go to a dedicated exhaust shop. The labor itself should be $100-200 max. You can find tips online or even sometimes advance auto parts has decent ones (without any large labeling). If you are second doubting it, don't. What you can do is have them cut off the muffler and then turn the car on and rev it, once you're at this point, you will be convinced. Best mod/exhaust you can get for the money. Unless you have a grand to drop on a PE exhaust, this is the next best option, to some even better than the PE. I only get good compliments on it. Honestly, the only down side is your fuel economy will go down, not because of the muffler delete affecting it, but because you'll want to drive in second gear everywhere just so you can hear it. As James May would say, it gives you a fizzy feeling at the tip of your gentleman's parts.

Originally Posted by howardx

Having a muffler delete right now, I can agree with you for the most part. It's loud enough to have a presence but not over bearing where it's obnoxious. However, the droning I hear while driving uphill is a bit annoying. This is why I want to modify my muffler and put it back on to achieve something closer to PE.

These 2 replies are in a nutshell the see-saw I've been experiencing every time I read about muffler delete. Drone issue is clearly... unclear. I gotta find a car with this mod to check it out but none found so far.

[Tom Droze]

Originally Posted by Ali-323i

Unrelated, but save your money for a tune rather than sprintbooster. All the SB does is make the car think you've pushed the pedal further than you have (something you can do with your foot without spending any money).

A tune will actually help reduce throttle lag, plug give you a better driving experience via a bit more HP and a smoother power band.

With respect to the Sprint Booster, what you said isn't exactly true; and please keep in mind I had a Sprint Booster before getting the AA tune. The SB will remove the throttle lag thus improving the drivability of the car but that is all. The problem with trying to compensate by pushing the gas pedal further down is that the throttle lag is still present and when the lag goes away, the gas pedal position is not where you want it to be.

[howardx]

Originally Posted by DaanBMW

These 2 replies are in a nutshell the see-saw I've been experiencing every time I read about muffler delete. Drone issue is clearly... unclear. I gotta find a car with this mod to check it out but none found so far.

It drones when I'm accelerating in 6th gear. If you have a manual, you most likely won't be climbing a hill in 6th gear. On the highway, however, you'll be in 6th gear and hear the drone. But, you'll barely hear it over the louder ambient noise from driving at highway speeds.

[DaanBMW]

Originally Posted by howardx

It drones when I'm accelerating in 6th gear. If you have a manual, you most likely won't be climbing a hill in 6th gear. On the highway, however, you'll be in 6th gear and hear the drone. But, you'll barely hear it over the louder ambient noise from driving at highway speeds.

A decade+ ago or more I thought I would not want a sport suspension on my vw golf, that it'd be too grinding for everyday use, and an in-between HD suspension would be a better compromise. Then I discovered the Passat the wife was driving had sport susp and it was the thing that actually made me buy it for her. Turns out my fillings were ready to endure anything others can find grinding (incl. casual passengers) and I hate nothing more then a car turning like a boat. My point being - I expect downsides. How bad are they to me ?

[El Cheapo Loco]

Originally Posted by DaanBMW

A decade+ ago or more I thought I would not want a sport suspension on my vw golf, that it'd be too grinding for everyday use, and an in-between HD suspension would be a better compromise. Then I discovered the Passat the wife was driving had sport susp and it was the thing that actually made me buy it for her. Turns out my fillings were ready to endure anything others can find grinding (incl. casual passengers) and I hate nothing more then a car turning like a boat. My point being - I expect downsides. How bad are they to me ?

If you are even remotely concerned about a stiff suspension, then you will not like the drone. A muffler or resonator delete WILL drone when the engine is under load, regardless of transmission type. It's not terrible, headache-inducing drone but it's not a refined sound.

[JuniorB]

I've considered the cut and paste,but,one,it's a bmw na 6, not much to do with that. Two,its hard to tell what that sound like on a you tube video doing neutral revs. These manufacturers know first hand what an exhaust will do,and what's it's capable of. Funny how a muffler delete compromises an exhaust. I'm looking into a flow thu muffler.,quite,yet suttle. Still it will give good numbers,an ice rumble,and still say(bmw)

[avocet]

Well, for anyone interested, I gutted my oem muffler. I cut out all the pipes but still used the baffled sections and left all the packing in there.



The red lines is where I cut. i just used a sawzall with a metal cutting blade. It cut through like a hot knife in butter!!! lol.

After the first start, it was very quiet, to the point of me thinking it was a waste of time. But after a few weeks it started to get a little bit of throat and is now quite nice! I am very tempted to leave it as is.

Because it was so quiet, I had gone and grabbed a second oem muffler for 20$ off craigslist and am planning a second attempt at doing this to make it a little bit more... ahem, sporty. By leaving in the pipe marked yellow, the exhaust path will go through the baffles only once directly from entering the muffler, then straight out the exhaust. My current set up has all the exhaust gases going though the baffled area though 5 different ports. It should make it alot less muffled and should still utilize the open area of the muffler for resonance suppression. ie drone.




My aa gen 1 exhaust with the aa headers was simply ignorant loud and had miserable levels of drone. I had a spiral sound baffle in there, but it droned like hell with the header. I took it out and the drone actually was reduced, but it became hella loud.

Since this other muffler is only 20$ I will be doing this mod in the near future and will post my results! It won't be for a few weeks though, because I have a very busy summer ahead of me...


P.S. Thank you OP(howardx) since I used your pic and used paint to mod it!!!



P.S.S. I will also say this thing simply pulls harder through the midrange with the aa exhaust removed and the modded muffler in place. No placebo. It pulls harder.

[Twoforty]

This is a very bad design muffler with respect to engine performance. OK for muffling the sound but definitely a power killer.
It should be obvious from "fluid flow 101" that baffles and bends are the absolute enemy to smooth gas/fluid flow.
The only suitable design to minimise raising back pressure due to hindered gas flow is such as you will see in the resonator.
Here you have a straight through perforated pipe; no baffles; no direction changes, no velocity changes to overcome the dynamic inertia of the gas moving between voids of low velocity between the baffles and then entering pipes where high velocity is present.
Ideally mufflers should be "straight through", so you could roll a golf ball through from one end and out the other end, unobstructed.
I would suggest that rear muffler be removed and a second small resonator style unit be attached at the rear end.
I'm thinking there's good power and sound potential waiting and avoid the drone.
Or fit a relatively straight (perforated) pipe through your gutted rear muffler, minus the baffles.