[djn121]

I've read through a ton of threads on cat vs catted downpipes and have a specific question for you all on the sound change between driving modes -

Car: 2019 330xi

I just got a BM3 flash, love it, but am looking to get more power.. However, my wife uses this car from time to time and I want to keep the sound, atleast when in comfort mode, to a minimum.

So my question is; When adding a downpipe, whether with a cat or catless, when you have the driving mode set to comfort or eco-pro and the exhaust flaps are closed, how does the car sound? Does it retain most of the stock muffeling caused by the flaps? I ask because the difference is pretty drastic when switching between modes with the stock downpipe.

Can't find a single video displaying in sport vs other modes and figured I'd ask.

Also, if anyone has one for sale, shoot me a DM.

Thanks!

[djn121]

Ended up buying and installing a catless downpipe.

For those curious:

In comfort, the coldstart was much louder but usual acceleration remains pretty much unchanged. I removed the coldstart within BM3 and reflashed, now it's silent. Problem solved.

In Sport / Sport +, It's fucking great. Great tone and the burbles are legendary. But love how I can switch back to comfort when I pull into my neighborhood and enter stealth mode.

[nicrom72]

Originally Posted by djn121

Ended up buying and installing a catless downpipe.

For those curious:

In comfort, the coldstart was much louder but usual acceleration remains pretty much unchanged. I removed the coldstart within BM3 and reflashed, now it's silent. Problem solved.

In Sport / Sport +, It's fucking great. Great tone and the burbles are legendary. But love how I can switch back to comfort when I pull into my neighborhood and enter stealth mode.

Do you have a clip? I want to swap out my factory down pipe but I'm on the fence as well about catless or high flow cat. Also. is the rest of your exhaust stock ?

[gbass85]

Originally Posted by nicrom72

Do you have a clip? I want to swap out my factory down pipe but I'm on the fence as well about catless or high flow cat. Also. is the rest of your exhaust stock ?

Second this - im looking to do the same thing with my car

[mike@x-ph.com]

Originally Posted by djn121

Ended up buying and installing a catless downpipe.

For those curious:

In comfort, the coldstart was much louder but usual acceleration remains pretty much unchanged. I removed the coldstart within BM3 and reflashed, now it's silent. Problem solved.

In Sport / Sport +, It's fucking great. Great tone and the burbles are legendary. But love how I can switch back to comfort when I pull into my neighborhood and enter stealth mode.

Congrats

[clemsonf31]

I would have been more concerned about exhaust smell from catless dp for my wife than any excess sound in comfort mode 🤣

Max

[mike@x-ph.com]

Originally Posted by clemsonf31

I would have been more concerned about exhaust smell from catless dp for my wife than any excess sound in comfort mode 🤣

Max