What Catless downpipe do you have?

F30.nyxie · 01-10-2019, 03:36 PM

Quote:

Originally Posted by Tiago@VRSF

Sounds great man, thanks for sharing!

More than welcome! With the dowpipe/muffler delete it really adds fun to the driving experience.

sumsom3 · 04-24-2019, 03:01 PM

Hey guys a quick question on the catless downpipes. How bad is the smell? I've heard that you can clearly smell burning oil going catless. Thoughts? experience?

rjd_F30 · 04-24-2019, 03:04 PM

Quote:

Originally Posted by sumsom3

Hey guys a quick question on the catless downpipes. How bad is the smell? I've heard that you can clearly smell burning oil going catless. Thoughts? experience?

Not bad at all in my experience. Only smell it outside the car or at a stop with windows down.

CandyRedRC46 · 04-25-2019, 08:42 AM

Quote:

Originally Posted by sumsom3

Hey guys a quick question on the catless downpipes. How bad is the smell? I've heard that you can clearly smell burning oil going catless. Thoughts? experience?

harden up

RMachuca3d · 04-25-2019, 12:10 PM

Quote:

Originally Posted by sumsom3

Hey guys a quick question on the catless downpipes. How bad is the smell? I've heard that you can clearly smell burning oil going catless. Thoughts? experience?

On my n26 i took off the secondary cat, and it smells like rotten eggs now, not the most pleasant smell but bearable, problem is now I'm hesitant to go full on catless, fearing this rotten egg smell will gain a ton of strength. Also, it might be a sign of a failing cat, so might have to go catless regardless

.

CandyRedRC46 · 04-25-2019, 12:41 PM

Catless n20 here. Its fine. There is zero rotten egg smell. You can only smell unburned gas fumes when you put your face right up to the exhaust tip, or just barely if the wind is blowing just right. Seriously I don't know why people are making this an issue lol.

Zanity · 04-25-2019, 01:14 PM

I 'm getting a custom fabricated catless downpipe, the total cost including install is half of what any branded downpipe would cost. I mean, it's just a 4" plumbing pipe, I don't think any brand makes a difference in performance, a fabricated one will have the fittings and size identical to the OEM, so it's going to fit.

CandyRedRC46 · 04-25-2019, 04:29 PM

Quote:

Originally Posted by Zanity

I 'm getting a custom fabricated catless downpipe, the total cost including install is half of what any branded downpipe would cost. I mean, it's just a 4" plumbing pipe, I don't think any brand makes a difference in performance, a fabricated one will have the fittings and size identical to the OEM, so it's going to fit.

I'm not sure what you mean by "its just a 4" plumbing pipe", but in reality the entrance is a v-band with a 3.63" inner diameter and it needs to be extremely true/precise or it will leak at the turbo. Then it needs to gradually reduce to a 2.25" inner diameter and be curved exactly right in order to slip into the catback exhaust. Plus the bracket needs to be in exactly the right spot to bolt up. Also you are going to want to incorporate a high quality flex pipe in there somewhere, which will cost close to a hundred dollars on its own. I think you are underestimating this greatly and you are going to be in for some surprises if you actually go through with this.

rjd_F30 · 04-25-2019, 04:33 PM

Quote:

Originally Posted by Zanity

I 'm getting a custom fabricated catless downpipe, the total cost including install is half of what any branded downpipe would cost. I mean, it's just a 4" plumbing pipe, I don't think any brand makes a difference in performance, a fabricated one will have the fittings and size identical to the OEM, so it's going to fit.

I agree with CandyRedRC46. It's a bit more intricate of a piece than you're making it sound. It's a tight fit at the turbo, and it has to be just right for that clamp to fit. I also recommend a flex portion so you're not putting all that stress on the turbo and manifold when the exhaust suspension gives a bit over bumps. A custom job can certainly be done if that's the route you want to go, but I don't want you to think any old metal worker can whip one up no problem

Zanity · 04-26-2019, 09:48 AM

Well, the fitting isn't an issue because its being welded on. I went to the shop and they quoted me $250CAD ($185USD) for fabrication and install so to me it was a no brainer

You have a point for the flex portion removed, I'll ask them if they can cut that off the OEM and weld it on

sspade · 04-26-2019, 10:00 AM

Quote:

Originally Posted by Zanity

Well, the fitting isn't an issue because its being welded on. I went to the shop and they quoted me $250CAD ($185USD) for fabrication and install so to me it was a no brainer

You have a point for the flex portion removed, I'll ask them if they can cut that off the OEM and weld it on

Its going to be interesting to hear how they connect the turbo side without the proper fitting and clamp. The other side is just pipe to pipe and can easily be welded together...

I dont believe they will weld the pipe directly to the turbo... and if they are planning that - I wouldnt let them...

The two main reasons for a properly engineered aftermarket pipe are the TURBO SIDE connection and the flex-pipe portion. But in the end... it is just a hollow pipe.

Zanity · 04-26-2019, 10:25 AM

Quote:

Originally Posted by sspade

Its going to be interesting to hear how they connect the turbo side without the proper fitting and clamp. The other side is just pipe to pipe and can easily be welded together...

I dont believe they will weld the pipe directly to the turbo... and if they are planning that - I wouldnt let them...

The two main reasons for a properly engineered aftermarket pipe are the TURBO SIDE connection and the flex-pipe portion. But in the end... it is just a hollow pipe.

I think the plan is to cut the pre-cat and cat only (the 4" big can), and keep all the connection fittings and O2 ports. But thanks to you guys, I'll make sure the flex vibration isolator stays as well.

CandyRedRC46 · 04-29-2019, 08:07 AM

So you're basically just chopping up and rewelding the factory down pipe? How would this be any different or better than simply gutting the cat?

rjd_F30 · 04-29-2019, 08:12 AM

Quote:

Originally Posted by CandyRedRC46

So you're basically just chopping up and rewelding the factory down pipe? How would this be any different or better than simply gutting the cat?

Sounds like basically a more professional/refined way of gutting the cat.

MacklinUSOB · 04-29-2019, 04:40 PM

Quote:

Originally Posted by rjdnyy224

Sounds like basically a more professional/refined way of gutting the cat.

rjd_F30 · 04-29-2019, 06:15 PM

Quote:

Originally Posted by MacklinUSOB

cat...alytic converter

D041987 · 04-29-2019, 08:02 PM

Should just get the Circuit Werks downpipe. I had it for years till I went custom turbo. No issues and fitment was great. Pipe is a pipe! No need to spend loads of money on it.

Zanity · 05-01-2019, 12:03 PM

Quote:

Originally Posted by D041987

Pipe is a pipe! No need to spend loads of money on it.

exactly my thought, that's why i'm gutting the cat

Craeftig · 05-05-2019, 07:22 PM

Quote:

Originally Posted by drivef30

Just want to see what people ended up buying. Im looking to buy a catless downpipe but haven't had luck with my recent purchase with VRSF.
So just wondering what you guys are running on your N20 EWG f30!

Im looking to try VRSF but curious what you guys recommend.

ER, VRSF, WAGNER, AR, AFE DOWNPIPE?

ER catless N26

sspade · 05-06-2019, 08:48 AM

Circuit Werks N26 catless

thebigbuff · 05-10-2019, 10:40 AM

My N20 features the stock downpipes with the screwdriver smash mod.

Works fantastic and was free.

04-24-2019, 03:01 PM	#24
sumsom3 New Member 0 Rep 25 Posts Drives: 2014 320xi xDrive with jb1 tun Join Date: Sep 2018 Location: Massachusetts iTrader: (0)	Hey guys a quick question on the catless downpipes. How bad is the smell? I've heard that you can clearly smell burning oil going catless. Thoughts? experience?
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04-25-2019, 12:41 PM	#28
CandyRedRC46 Lieutenant 242 Rep 420 Posts Drives: 2013 328i Join Date: Feb 2018 Location: Florida iTrader: (0)	Catless n20 here. Its fine. There is zero rotten egg smell. You can only smell unburned gas fumes when you put your face right up to the exhaust tip, or just barely if the wind is blowing just right. Seriously I don't know why people are making this an issue lol.
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04-25-2019, 01:14 PM	#29
Zanity Major 731 Rep 1,045 Posts Drives: 428i Join Date: Oct 2018 Location: BC, Canada iTrader: (0)	I 'm getting a custom fabricated catless downpipe, the total cost including install is half of what any branded downpipe would cost. I mean, it's just a 4" plumbing pipe, I don't think any brand makes a difference in performance, a fabricated one will have the fittings and size identical to the OEM, so it's going to fit. __________________ Mods: Dinan Tuned, Intake, Catless DP
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04-26-2019, 09:48 AM	#32
Zanity Major 731 Rep 1,045 Posts Drives: 428i Join Date: Oct 2018 Location: BC, Canada iTrader: (0)	Well, the fitting isn't an issue because its being welded on. I went to the shop and they quoted me $250CAD ($185USD) for fabrication and install so to me it was a no brainer You have a point for the flex portion removed, I'll ask them if they can cut that off the OEM and weld it on __________________ Mods: Dinan Tuned, Intake, Catless DP
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04-29-2019, 08:07 AM	#35
CandyRedRC46 Lieutenant 242 Rep 420 Posts Drives: 2013 328i Join Date: Feb 2018 Location: Florida iTrader: (0)	So you're basically just chopping up and rewelding the factory down pipe? How would this be any different or better than simply gutting the cat?
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04-29-2019, 08:02 PM	#39
D041987 Big Turbo Boys N Girls 327 Rep 579 Posts Drives: 2012 328I 6speed Join Date: Apr 2016 Location: Lynnwood, WA iTrader: (0)	Should just get the Circuit Werks downpipe. I had it for years till I went custom turbo. No issues and fitment was great. Pipe is a pipe! No need to spend loads of money on it. __________________ 2012 F30: G25-660 Bottom Mount Mani+ DP+ Intake, CSF FMIC, VRSF CP, Walbro 450 LPFP, PR Injection with AIC 4, S63TU Injectors, Tuned with BM3, ZF Race 4 Puck and Non SSA Pressure plate, Catless, 3.5" Quad Muffler, Custom Valved Bilstein B8 + H&R SS. Max 456 WHP - 452 WTRQ. Currently tuned down to 434 WHP and 362 WTRQ to save the rods.
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05-06-2019, 08:48 AM	#42
sspade Major General 2466 Rep 5,457 Posts Drives: F30 Join Date: Oct 2017 Location: Stevenson, WA iTrader: (3) Garage List 2016 BMW 320i [7.87] 2014 BMW 328i [6.83]	Circuit Werks N26 catless
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05-10-2019, 10:40 AM	#43
thebigbuff New Member 0 Rep 6 Posts Drives: 2012 328i Sport-Line Join Date: May 2019 Location: Ontario iTrader: (0)	My N20 features the stock downpipes with the screwdriver smash mod. Works fantastic and was free.
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