[Turboxer]

Hey guys. I usually just lurk around. I had an 11 335D CPO car that I had a JBD box on and that’s it. Was fun but in the shop ALL the time for sensors/glow plugs so I sold it when the CPO was expiring

Anyways, the guy I sold it to did a delete and has had zero problems in the 2 years since. So... I’m looking to get back in the game, but it seems all the videos I watch the cars are decently loud. I’m not looking for a loud 600hp car... just something that isn’t going to be in the shop all the time that was as fast as my last one on a regular JBD tune.

So... my question is... how do I go about that? I know I need catted downpipe to reduce the odor... but what about the sound?

Thanks guys.

[RL18]

Just use a muffler. Maybe like a walker quiet flow. I know that diesel trucks use them and they're quiet, I'm sure they have a configuration that would fit these cars.

[Persian Whisperjet]

You can also tune out the awful DEF/SCR system and leave the DPF intact. No louder than stock.

[Nadir Point]

I wouldn't call IAknown's loud at all. I think a better question might be "can a 335D sound badass and not be loud?". Too bad exhaust kits don't come with published decibel@load/rpm specs - like a dyno chart for sound.

[RL18]

Originally Posted by Nadir Point

I wouldn't call IAknown's loud at all. I think a better question might be "can a 335D sound badass and not be loud?". Too bad exhaust kits don't come with published decibel@load/rpm specs - like a dyno chart for sound.

Honestly completely straight piped isn't necessarily "loud" only at certain rpm. I think in low rpm where our turbos are acting like a compound turbo it's pretty quiet, but when the bypass valves start to open is where it gets really loud like a single turbo. So I'm sure iaknowns exhaust is probably the quietest exhaust available but when you get on it it still sounds good with out being to loud. If it's still too loud then add a muffler. Easy as that.

[Turboxer]

Originally Posted by Persian Whisperjet

You can also tune out the awful DEF/SCR system and leave the DPF intact. No louder than stock.

Hmmmm interested in this. This would solve the problem the same as deleting it?

[Turboxer]

Originally Posted by Nadir Point

I wouldn't call IAknown's loud at all. I think a better question might be "can a 335D sound badass and not be loud?". Too bad exhaust kits don't come with published decibel@load/rpm specs - like a dyno chart for sound.

Yea, just want something that is decently quiet so I can roll up thethe house and not wake up the kid. Or drive and not have any interior noise much past the usual.

[335stoner]

If you are worried about noise then get the atm with cat and muffler.. it's just like stock

[dmanb2b]

Originally Posted by 335stoner

If you are worried about noise then get the atm with cat and muffler.. it's just like stock

I wouldn't call it like stock. Stock is quiet no matter how hard you romp on it. Catted dp with mufflers will still yield a mild whistle and a good exhaust note at WOT, but indeed is relatively quiet compared to no cat in DP.

[Mrdeezy]

I had a 335d with all deletes and an AA rodriguez tune 2.8. Great stuff. I sold the car early last year and would never do the deletes again unless I lived in BFE. Just going through a drive thru was embarrassing. the smell was awful and I just didn't care for it the bumper was constantly covered in soot too. The power was great and so were the MPG's, sound wasn't too loud either.

[BB_cuda]

A gutted DPF is more quiet than a catted downpipe. I tested both back to back about a week apart. Smell is better too. I don’t have room for mufflers or I’d run them too. Spare tire underneath was my choice instead 😎.

I did suffer a mild power loss compared to catless downpipe I started with. I’d have to log in some way to quantify this.

[DieselOG]

I would not consider the 335d "loud" when straight piped, sounds just right to me. I love rolling down the window and listening to it in parking garages. The smell however is a different story, it really does reek. I was honestly amazed about how much more it smelled then my deleted TDI's, but it doesn't bother me enough to want pay for a catted downpipe or sacrifice any performance

[Turboxer]

Thanks guys. So will a catted downpipe cure the smell? Might be a deal breaker.

I live in a place that has no emissions, so I’m good there.

[sunny_j]

Even with a DOC you will smell diesel exhaust fumes... Just not as bad as a downpipe without a DOC

[dmanb2b]

Originally Posted by sunny_j

Even with a DOC you will smell diesel exhaust fumes... Just not as bad as a downpipe without a DOC

^^^^This, DOC = city bus from the 90's while no DOC = farm tractor. It's way more tolerable with DOC but not odorless

[RL18]

Y'all are sensitive. It smells fine lol

[Nadir Point]

I love the small of diesel exhaust in the morning. Or evening.

[robnitro]

In order of smell.
Stock > Gutted dpf with factory doc > catted dp > no cat

[rtd2]

Has anyone placed a resonator in the exhaust system after doing deletes? If so, does it make a meaningful difference? I have full deletes and would like the car to be quieter than it is now. It’s not bad inside the car but somewhat loud from outside. I'm considering a cat and possibly a resonator.

[Persian Whisperjet]

Originally Posted by Turboxer

Hmmmm interested in this. This would solve the problem the same as deleting it?

Yes, JR has a tune that keeps the DPF and deactivates the SCR system (which stays in place). Possibly others have that option as well. It's quite civilized. Sounds the same as stock really.

[RL18]

Originally Posted by rtd2

Has anyone placed a resonator in the exhaust system after doing deletes? If so, does it make a meaningful difference? I have full deletes and would like the car to be quieter than it is now. It's not bad inside the car but somewhat loud from outside. I'm considering a cat and possibly a resonator.

I have two resonators where the stock mufflers use to be and they actually make my exhaust louder.

A resonator as it was explained to me by my exhaust shop helps to "tune" the exhaust note. NOT make it quieter. So my exhaust isn't as loud as a straight pipe but it sounds way more refined. But it's still loud hah...

If you want to be quieter a muffler will do that.

[dmanb2b]

Originally Posted by rtd2

Has anyone placed a resonator in the exhaust system after doing deletes? If so, does it make a meaningful difference? I have full deletes and would like the car to be quieter than it is now. It’s not bad inside the car but somewhat loud from outside. I'm considering a cat and possibly a resonator.

catted dp will tone it down a few notches