[Golo2016]

Do the muffler would have to be cut if MPE is to be installed?

[f30m]

Originally Posted by Golo2016

And risking blow something up? Nah, I think i'll be alright with just a little noise and keep my warranty. Not ready to pay to play yet.

I don't really see how adding a downpipe could potentially blow something up, it's just an exhaust upgrade that frees up hp by reducing back pressure, etc. it doesn't add boost or alter timing like a tune would. So I would say they are safe, but you'll likely get a check engine light if you don't get a tune or modify the O2 housing in some way because of the car delete/high flow cat (depending on what type of downpipe). As long as it's installed properly you should have no problems.

[riskmaker76]

It shouldn't but your reducing back pressure which in theory should increase the amount of air flow which in theory could change the Air to Fuel ratio. Running too lean will surely cause damage to the motor over time.

However, the computer will adjust the timing, adjust the amount of fuel, etc. to compensate for the added air flow - thus why it usually translates into more power. However, However, if its too radical the computer will throw a code and go into a "safe" mode. I havent heard of this happening to anyone with our cars; at least with the popular downpipes and stock exhaust.

In the old days before computers you add high flow headers, remove the cat and high flow exhaust you were glutton for detonation and possible motor damage -( without tuning the air/fuel).

Motors - Many components From intake to exhaust are a well balanced ecosystem. You disrupt one without altering the other usually results in loss of power, poor drivability or risk to damage the motor. Modern computers though just about eliminate the damage part.

Originally Posted by f30m

I don't really see how adding a downpipe could potentially blow something up, it's just an exhaust upgrade that frees up hp by reducing back pressure, etc. it doesn't add boost or alter timing like a tune would. So I would say they are safe, but you'll likely get a check engine light if you don't get a tune or modify the O2 housing in some way because of the car delete/high flow cat (depending on what type of downpipe). As long as it's installed properly you should have no problems.

[STR8-6IX]

Originally Posted by riskmaker76

It shouldn't but your reducing back pressure which in theory should increase the amount of air flow which in theory could change the Air to Fuel ratio. Running too lean will surely cause damage to the motor over time.

However, the computer will adjust the timing, adjust the amount of fuel, etc. to compensate for the added air flow - thus why it usually translates into more power. However, However, if its too radical the computer will throw a code and go into a "safe" mode. I havent heard of this happening to anyone with our cars; at least with the popular downpipes and stock exhaust.

In the old days before computers you add high flow headers, remove the cat and high flow exhaust you were glutton for detonation and possible motor damage -( without tuning the air/fuel).

Motors - Many components From intake to exhaust are a well balanced ecosystem. You disrupt one without altering the other usually results in loss of power, poor drivability or risk to damage the motor. Modern computers though just about eliminate the damage part.

The computer will adjust timing within 500km or so.
But resonator backpressure is the type you want to keep. Reducing backpressure ideally you want to remove your primary cats and replace muffler with something high flow.

[riskmaker76]

Yes... buts easy as there is a small dimple right where you need to cut the stock exhaust off... Of course you should always dry fit before you start cutting just to make sure.

Originally Posted by Golo2016

Do the muffler would have to be cut if MPE is to be installed?

[2turboBMW]

I can't imagine that deleting a resonator would have any negative impact on the car as some have implied. The BMW MPPK and Dinan exhaust systems both delete the resonators and they don't void warranty. Deleting the resonators will be the first mod I make on my 340i.

[lkstaack]

Originally Posted by 2turboBMW

I can't imagine that deleting a resonator would have any negative impact on the car as some have implied. The BMW MPPK and Dinan exhaust systems both delete the resonators and they don't void warranty. Deleting the resonators will be the first mod I make on my 340i.

Neither the Dinan or BMW exhausts delete the resonator; they are both cat-back mufflers. But you are correct in saying that there wouldn't be any major negative impacts by removing them. The purpose of resonators are to tune exhaust sound frequencies to eliminate drone. Removing them could invite drone, depending on the exhaust used.

[BLACK HAWK DOWN]

Originally Posted by lkstaack

Neither the Dinan or BMW exhausts delete the resonator; they are both cat-back mufflers. But you are correct in saying that there wouldn't be any major negative impacts by removing them. The purpose of resonators are to tune exhaust sound frequencies to eliminate drone. Removing them could invite drone, depending on the exhaust used.

Correction. The MPPSK does remove the resonators and so does the Dinan Muffler/Midpipe setup. The MPE and Dinan Muffler retain the resonators.

[Climb Mode]

Interested in hearing thoughts/experiences on Dinan midpipe (thus resonator delete) while keeping stock exhaust.

My indy mechanic highly recommended the above as a good bang for the buck to get a more aggressive exhaust note.

Concerns:
- 6MT so highway cruising RPM's are ~3,000. Drone? Mech said no.
- It's a lease. How feasible is it to get the factory midpipe put back on prior to lease return?
- Chance of finding too much crackle?

Thanks all!

[Golo2016]

Originally Posted by Climb Mode

Interested in hearing thoughts/experiences on Dinan midpipe (thus resonator delete) while keeping stock exhaust.

My indy mechanic highly recommended the above as a good bang for the buck to get a more aggressive exhaust note.

Concerns:
- 6MT so highway cruising RPM's are ~3,000. Drone? Mech said no.
- It's a lease. How feasible is it to get the factory midpipe put back on prior to lease return?
- Chance of finding too much crackle?

Thanks all!

I'm in the same boat so to speak, I think i'm going to start with the dinan midpipe( as I can install it with a buddy of mine) vs just getting the resonators cut off. Two shops quote me around $300 to do it, for a a little bit more I can just get the Dinan's that is going to be stainless steel and are easy reversible.

[lkstaack]

Originally Posted by toybm

Correction. The MPPSK does remove the resonators and so does the Dinan Muffler/Midpipe setup. The MPE and Dinan Muffler retain the resonators.

That is true for the 340, not for the 335i.

[BLACK HAWK DOWN]

Originally Posted by lkstaack

That is true for the 340, not for the 335i.

Sorry. I misunderstood, B58 Mods section and 2turboBMW was referring to a 340. Didn't know there were references to the 335.

[2turboBMW]

I'm not sure about drone with the resonator delete on a 6MT 340/440 with stock muffler and would definitely be interested in hearing if anyone has this experience. I did install a wider downpipe with high flow cat and resonator on my last car and it did drone a little bit.

[2turboBMW]

Originally Posted by Golo2016

I'm in the same boat so to speak, I think i'm going to start with the dinan midpipe( as I can install it with a buddy of mine) vs just getting the resonators cut off. Two shops quote me around $300 to do it, for a a little bit more I can just get the Dinan's that is going to be stainless steel and are easy reversible.

Originally Posted by Golo2016

I'm in the same boat so to speak, I think i'm going to start with the dinan midpipe( as I can install it with a buddy of mine) vs just getting the resonators cut off. Two shops quote me around $300 to do it, for a a little bit more I can just get the Dinan's that is going to be stainless steel and are easy reversible.

Please report back if you do this! Not that I want you to be the guinea pig ;-) I just have a few more weeks before my 340 is delivered.

[Golo2016]

Originally Posted by 2turboBMW

Please report back if you do this! Not that I want you to be the guinea pig ;-) I just have a few more weeks before my 340 is delivered.

It's all good, somebody have to be.

Besides, there's videos on Youtube that someone did it with the AWE joints.

[blckz06]

So just to confirm, the 340i MPPSK set up has absolutely no resonators?

Originally Posted by toybm

Correction. The MPPSK does remove the resonators and so does the Dinan Muffler/Midpipe setup. The MPE and Dinan Muffler retain the resonators.

[BLACK HAWK DOWN]

Originally Posted by blckz06

So just to confirm, the 340i MPPSK set up has absolutely no resonators?

That is correct, there are absolutely no resonators installed. In fact, in Sport and Sport+ modes the muffler is bypassed completely.

http://www.realoem.com/bmw/enUS/show...diagId=03_0220

[blckz06]

I figured haha. My car sounds mental at full tilt, the muffler bypass explains a lot. I do have a catless downpipe though.

Originally Posted by toybm

That is correct, there are absolutely no resonators installed. In fact, in Sport and Sport+ modes the muffler is bypassed completely.

http://www.realoem.com/bmw/enUS/show...diagId=03_0220

[MUFCbmwbear]

I will be adding the AWE midpipe to my MPE soon. Easy lease reversible. Will report back

[NYC_340i]

Originally Posted by Climb Mode

Interested in hearing thoughts/experiences on Dinan midpipe (thus resonator delete) while keeping stock exhaust.

My indy mechanic highly recommended the above as a good bang for the buck to get a more aggressive exhaust note.

Concerns:
- 6MT so highway cruising RPM's are ~3,000. Drone? Mech said no.
- It's a lease. How feasible is it to get the factory midpipe put back on prior to lease return?
- Chance of finding too much crackle?

Thanks all!

Originally Posted by 2turboBMW

I'm not sure about drone with the resonator delete on a 6MT 340/440 with stock muffler and would definitely be interested in hearing if anyone has this experience. I did install a wider downpipe with high flow cat and resonator on my last car and it did drone a little bit.

Not too sure of the major sound difference betweeen 6MT and 8AT but I had a local shop remove both my resonators and put one new pipe in a week ago and it sounds pretty good. With everything else stock and with the windows up you do get slightly more drone in city driving but nothing major on the highway in comfort mode. In sport mode the drone does kick up a bit on the highway but with music playing at even a low volume its not too noticeable. I did do the golf tee mod when I first got the car so cold starts are a little too loud for my tastes (especially starting it in my garage lol) so I may test connecting the plug back again and see if it's worth it with having the quieter sound when driving in sport mode. I wish the valve will stay open all the time in sport mode but I don't think that's the case.

But with the windows down and in sport or manual mode it sounds amazing. Burbles all the time and pops on aggressive downshifts. Was thinking about getting a full catback but even though it will sound so much better, I can't complain with a $200 mod compared to a $2000+ exhaust system.

[Climb Mode]

^^^^ pretty sure, after the initial warm up, the valve will remain open continuously in sport/Sport +. Can someone confirm.

[Kwongyy]

On the same boat here. If I was to do resonator delete . Do I do both resonators or one near the front of the car or the 2nd one?

- also is there a U.K. seller for the Dinan midpipe