[gx5_027]

Resonator Delete & High-Flow Catted Downpipe (400 cell GESI cat) sound - 2019 40i with M Sport Exhaust:

What do you guys think?

And how does it sound compared to the M Performance Exhaust with OEM DP?

Any questions?

Cost in USD: $1000 for the DP; $110 for the resonator delete = ~$1,110

Still very tame in comfort. Cold start isn’t very loud (that is subjective). Sounds good in Sport/Sport+, and still not super loud! A nice compromise for a family vehicle. This has made driving in Sport a bit more fun.

Unfortunately, there are no mild crackles/burbles when downshifting, slowing down or coming to a stop. Through comments I've read in bimmerpost, I hear the MPE does have some crackles/burbles when coming to a stop. And with my set-up, revving when in park, doesn't sound like anything was done (at least from inside) - will have to step outside and have someone else rev the engine while I have a listen. I'm never ever going to rev the engine while it's in park, but, just a note to highlight some differences vs MPE. From the videos I've heard with the MPE, when the engine is revved in park, you can tell there's an exhaust, and it sounds relatively good (great vs stock).

Excited to eventually flash tune it for some more power and OEM sounding burbles (like the x3 m40i would be ideal imo). Waiting for MHD to release their DME unlocker module.

[atlas]

Sounds good to me!

You can try opening the exhaust flap (search the forum for which fuse to pull) and that will give some nice rumble at low rpm.

[gx5_027]

Originally Posted by atlas

Sounds good to me!

You can try opening the exhaust flap (search the forum for which fuse to pull) and that will give some nice rumble at low rpm.

atlas cool. I’ve heard of this. I think though, it might result in a bit of drone. I have bimmercode and “coded” (selected the button lol) where the exhaust flap is always open - too much drone, but will try again and see if I get some crackles.

I think a flash tune will give me what I want eventually!

[TimmyBHGM5]

Is there a GPF in the stock exhaust?

[flat6]

I’ve pulled the fuse and it’s a decent improvement during cold start and does r drone at highway speeds. I’m out of warranty now and want to program the exhaust for the X3 M40 sound you mentioned. Which exhaust tune are you considering?

Also, which downpipe did you go with?

[gx5_027]

Originally Posted by TimmyBHGM5

Is there a GPF in the stock exhaust?

Not sure to be honest

[gx5_027]

Originally Posted by flat6

I’ve pulled the fuse and it’s a decent improvement during cold start and does r drone at highway speeds. I’m out of warranty now and want to program the exhaust for the X3 M40 sound you mentioned. Which exhaust tune are you considering?

Also, which downpipe did you go with?

I’ll be going with MHD for the tune - not just an exhaust tune - it will bump up HP and TQ quite a bit.
I grabbed basically a clone of the Active Autowerke downpipe with the GESI cat -
No CEL.

[mobilejo]

I have a BM3 tune and the "M Sport exhaust" fitted from the factory (not M Performance exhaust) - using BM3 I have turned on GTS startup roar and I've set the flap to be open all the time in sport mode only. Those 2 features alone make a big difference.

The startup roar sounds great and having the flap open in sport mode at all times gives it a deep rumble even when just pootling around. Its not droney imo. But even so, as the flap operates as normal in comfort mode, its only loud when you want it to be.

I did try burbles using BM3 but nothing happened. Then I read that you don't want to use burbles if you have a petrol particulate filter (which I do - UK regulations) as throwing fuel down the exhaust system with a PPF is probably not the best idea, so I'll just live without burbles.

[RhinoComp]

Did you do both the DP and resonator delete at this same time? I've been curious about how much difference just doing to resonator delete would make on an otherwise stock exhaust.

[Dsmdrew]

I have a high flow dp and mhd stage 2. You will not get burpels! Maby if you cut the reignator out but I didn't want the drone. So I just bought a full exhaust. Not the mpe.

[gx5_027]

Originally Posted by RhinoComp

Did you do both the DP and resonator delete at this same time? I've been curious about how much difference just doing to resonator delete would make on an otherwise stock exhaust.

Rhino at Work Missed your question earlier. I didn't do the DP and resonator delete at the same time because I wanted to assess the change in sound. When removing the resonator it made a slight difference. Maybe like 10% louder.

[RhinoComp]

Originally Posted by gx5_027

Rhino at Work Missed your question earlier. I didn't do the DP and resonator delete at the same time because I wanted to assess the change in sound. When removing the resonator it made a slight difference. Maybe like 10% louder.

Gotcha! Appreciate the response on that. Any drone or notable unwanted cabin noise after just the resonator delete?

[gx5_027]

Originally Posted by RhinoComp

Gotcha! Appreciate the response on that. Any drone or notable unwanted cabin noise after just the resonator delete?

I would say at certain RPMs only, a tiny bit of drone (ever so slightly). My ears are also really good though. To the untrained ear, sounds like there's just an aftermarket exhaust installed. No complaints from wife either. No drone on highway (that would drive me insane and I would then revert back to stock).

[crowuhh]

Originally Posted by gx5_027

I would say at certain RPMs only, a tiny bit of drone (ever so slightly). My ears are also really good though. To the untrained ear, sounds like there's just an aftermarket exhaust installed. No complaints from wife either. No drone on highway (that would drive me insane and I would then revert back to stock).

Hi did the resonator delete make any audible difference in sound? Looking to do this on the 40i but the res delete on my 50i didn’t make much of a difference.