[ZM240i]

And so I've finally passed the 1,200-mile mark (break-in period) and am now looking into exhaust setups. My goal is to be louder than stock but not too loud (neighbor friendly-ish ) with minimal to no drone, if possible.

So I start with 4 and 5 stars rated muffler shops within a 100 mile radius (SoCal). I have quotes from a few shops including one that a fellow member here (Bimmer Bill/YT) used. These were for a muffler delete with bullet race mufflers and quad matte black double-walled tips.

One shop suggested that he can do the above and add J-pipes as well. This is the first time I've heard of these and he said he does a lot of them for muscle cars.

As I did some reading regarding J-pipes, it turns out that there's some math and some trial and error involved - unless somebody has already done it. I don't think anybody has done J-pipes in the G42 forum yet.

I found this table below but for the CTS-V. Can anybody here help me figure it out for the G42 B58?

- - - ETA

Update on Post #11

FWIW here’s the end product. I love it!

.

[mike@x-ph.com]

I wish you good luck, but I'd recommend holding off on that now.

It's not ideal to risk your new car's exhaust by having work done at a local shop.

Allow reputable exhaust companies time for research, development, and testing to produce the best possible setup for your car.

Patience will pay off in the end.

[joseph.m240i]

Added J pipe to my m240i when doing muffler delete. After all the math I decided to add 31inch j pipe. It only reduced drone for certain RPM. Not worth it. I will highly recommend get a aftermarket catback system.

[ZM240i]

Originally Posted by joseph.m240i

Added J pipe to my m240i when doing muffler delete. After all the math I decided to add 31inch j pipe. It only reduced drone for certain RPM. Not worth it. I will highly recommend get a aftermarket catback system.

Yes, the J-pipes targets very specific RPMs. What RPMs did your 31-inch J-pipes address?

Did you add or look into bullet resonators as well? Thoughts on these?

TIA

.

[ZM240i]

Originally Posted by mike@x-ph.com

I wish you good luck, but I'd recommend holding off on that now.

It's not ideal to risk your new car's exhaust by having work done at a local shop.

Allow reputable exhaust companies time for research, development, and testing to produce the best possible setup for your car.

Patience will pay off in the end.

The G42 is on its 2nd model year, do you see any other companies producing one for the B58?

These are already available AFAIK:

Remus
Milltek
Akrapovic
FI
dAHLer
AC Schnitzer
BMW MPE
Dinan - coming soon in forever seems like


.

[mike@x-ph.com]

Originally Posted by ZM240i

The G42 is on its 2nd model year, do you see any other companies producing one for the B58?

These are already available AFAIK:

Remus
Milltek
Akrapovic
FI
dAHLer
AC Schnitzer
BMW MPE
Dinan - coming soon in forever seems like


.

i thought I'm in the M2 section

[E63M6_G42M240i]

Originally Posted by mike@x-ph.com

I wish you good luck, but I'd recommend holding off on that now.

It's not ideal to risk your new car's exhaust by having work done at a local shop.

Allow reputable exhaust companies time for research, development, and testing to produce the best possible setup for your car.

Patience will pay off in the end.

Bimmer_Bill here. While I wouldn’t have a run of the mill muffler shop handle this job, my guy has been doing this for over 30 years (not just chopping welding), but he buildin custom exhausts and headers from scratch and for million dollar plus show cars (did a full Shelby Daytona Coupe last month). I highly doubt an exhaust system by milltek, Remus, etc will be any better and will likely cost more. The only exception I’d make would be for the M performance g42 m240i product since that will likely increase resale and is approved by BMW. However, since I like aggressive sound, AND emissions legality (that means an EPA legal DP), a muffler delete with resonators made sense. After having this setup for many months now I can tell you that most of the time it’s absolutely perfect. You can control sound by using different modes and I recommended muting (reduced sound mode) the extra sound through the speakers. The only part where it’s a little loud for me is on TRUE cold starts but that settles down with seconds. My $0.02.

PS- I just dynoed my car yesterday.

[ZM240i]

For those who have done a muffler delete on the B58 engine, at what RPM do you experience the worst drone?

- - -

And here's an excellent video if you wanna be schooled. He details all the principles and math involved in eliminating drone.

[heelsmj]

[QUOTE="E63M6_G42M240i;30099026"]
PS- I just dynoed my car yesterday.

AND???
How do you write that and not give us the results??

[viperx100]

[QUOTE=heelsmj;30103352]

Originally Posted by E63M6_G42M240i

PS- I just dynoed my car yesterday.

AND???
How do you write that and not give us the results??

Dude is such a tease!

[ZM240i]

So I've finally done it. My goals were:

1). muffler delete
2). matte black double-walled tips
3). exhaust sound louder than stock
4). minimal to zero drone, if possible
5). install race bullet mufflers/resonators
6). add J-Pipes per shop recommendation

I have only driven the car for less than 10 miles from the shop as of now. So far, I do know that there is no drone at freeway cruising speeds.

[ryo-]

Originally Posted by ZM240i

So I've finally done it. My goals were:

1). muffler delete
2). matte black double-walled tips
3). exhaust sound louder than stock
4). minimal to zero drone, if possible
5). install race bullet mufflers/resonators
6). add J-Pipes per shop recommendation

I have only driven the car for less than 10 miles from the shop as of now. So far, I do know that there is no drone at freeway cruising speeds.

definitely do a video with that setup if you can. I am curious on how it sounds.

[ZM240i]

Originally Posted by ryo-

definitely do a video with that setup if you can. I am curious on how it sounds.

Ideally I would have wanted a before and after but I had no extra set of hands.

Here’s a video I made but it still doesn’t quite sound as in real life. Take it with a grain of salt.

[wb8164]

Sounds great on my computer
The fabrication and welds look super clean. Whoever did the work
is part artist, part craftsman.

[ryo-]

damn that actually sounds really good lol

[Sonic RR]

Originally Posted by ZM240i

So I've finally done it. My goals were:

1). muffler delete
2). matte black double-walled tips
3). exhaust sound louder than stock
4). minimal to zero drone, if possible
5). install race bullet mufflers/resonators
6). add J-Pipes per shop recommendation

I have only driven the car for less than 10 miles from the shop as of now. So far, I do know that there is no drone at freeway cruising speeds.

Nice work!

Any plans to reproduce or sell design for someone else to do it?
I am hoping for a more economical solution w/less weight and more sound.


Sonic

[ZM240i]

Originally Posted by Sonic RR

Nice work!

Any plans to reproduce or sell design for someone else to do it?
I am hoping for a more economical solution w/less weight and more sound.

Sonic

LOL, no plans.

But if anybody is willing to work with the shop I used in SoCal/Inland Empire, let me know.

[Superrookie]

Originally Posted by ZM240i

LOL, no plans.

But if anybody is willing to work with the shop I used in SoCal/Inland Empire, let me know.

Your car sounds great! Mind sharing which shop in IE helped you put this together?

[VegasG42]

Originally Posted by ZM240i

LOL, no plans.

But if anybody is willing to work with the shop I used in SoCal/Inland Empire, let me know.

Any updates on your exhaust ? Any new videos ?

Do you mind sharing what shop

[NoDramaG42]

Originally Posted by ZM240i

FWIW here’s the end product. I love it!

Hey OP, what was the final length of the J-pipe?

[Rdurty2]

Originally Posted by NoDramaG42

Hey OP, what was the final length of the J-pipe?

OP hasn’t been on the forums since February.