Catless DPS? Or Catless with resenator DPS?

Cmfigueroa16 · 03-01-2018, 03:37 PM

Hey guys I have a F10 N55 and I'm looking to buy Downpipes. Which route should I go?

AR catless Downpipes

Or

AR catless WITH RESONATOR downpipes?

Who recommends what?

jooobi3 · 03-01-2018, 03:57 PM

Quote:

Originally Posted by Cmfigueroa16

Hey guys I have a F10 N55 and I'm looking to buy Downpipes. Which route should I go?

AR catless Downpipes

Or

AR catless WITH RESONATOR downpipes?

Who recommends what?

Isn't the point of getting an aftermarket downpipe is to increase performance? If that's the case you should go with catless for a seamless smooth pipe instead of sticking a resonator in there. But, if you care about the noise>performance go with the resonator.

lsturbointeg · 03-01-2018, 04:11 PM

agree! Some states have smog emissions so if i was back in Cali i would opt for Catted but being in OH there's no emissions so i'd go Catless in a heart beat! is there emissions in NY?

mike@x-ph.com · 03-08-2018, 06:44 PM

If you are keeping stock turbo, go with catless with resonators.
Performance increase is the same as catless and it sounds better

NYC535iowner · 03-10-2018, 03:53 AM

Quote:

Originally Posted by mike@x-ph.com

If you are keeping stock turbo, go with catless with resonators.
Performance increase is the same as catless and it sounds better

I am looking to do the same as Cmfigueroa16.

@mike@x-ph.com You say to go with the catless WITh resonator if keeping the stock turbos. What can happen if keeping the stock turbos and getting the NON resonator?????

mike@x-ph.com · 03-10-2018, 01:47 PM

Quote:

Originally Posted by NYC535iowner

I am looking to do the same as Cmfigueroa16.

@mike@x-ph.com You say to go with the catless WITh resonator if keeping the stock turbos. What can happen if keeping the stock turbos and getting the NON resonator?????

Only difference between the 2 on stock turbos is that non res sounds cleaner.
Catless sounds raspy on high RPM thats all

NYC535iowner · 03-12-2018, 09:41 PM

thank you.

N52 Moistenor · 03-13-2018, 07:16 PM

Quote:

Originally Posted by kthxbai

Isn't the point of getting an aftermarket downpipe is to increase performance? If that's the case you should go with catless for a seamless smooth pipe instead of sticking a resonator in there. But, if you care about the noise>performance go with the resonator.

resonators improve exhaust flow by resonating the exhaust flow, which is a form of turbulence (improve the flow of exhaust, essentially a good type of backpressure) which also fine-tunes the exhaust note to sound how AR thinks this inline 6 engine should sound. I recommend resonated.

Charter23 · 03-13-2018, 07:21 PM

Just remove your stock downpipe, drill out the catalytic medium, clean it up and reinstall. Done.

bradsm87 · 03-13-2018, 11:18 PM

Quote:

Originally Posted by Charter23

Just remove your stock downpipe, drill out the catalytic medium, clean it up and reinstall. Done.

The rapid changes in pipe diameter are bad for both flow and sound. A straight pipe is much better.

bradsm87 · 03-13-2018, 11:18 PM

I wouldn't bother with a resonator that close to the turbo. The packing will be burnt out in no time. It's just too close.

Charter23 · 03-14-2018, 07:15 AM

Quote:

Originally Posted by bradsm87

Quote:

Originally Posted by Charter23

Just remove your stock downpipe, drill out the catalytic medium, clean it up and reinstall. Done.

The rapid changes in pipe diameter are bad for both flow and sound. A straight pipe is much better.

Theoretically? Yes.
Noticeably? Not even a little.

The forum members who have hollowed out their stock downpipes have great things to say. The only downside I have read about is that it may not be as loud or raspy as aftermarket. To some that is yet another reason why OEM could be a better option.

03-01-2018, 03:37 PM	#1
Cmfigueroa16 Private 6 Rep 78 Posts Drives: 2012 535i x drive Join Date: Aug 2017 Location: White plains NY iTrader: (0)	Catless DPS? Or Catless with resenator DPS? Hey guys I have a F10 N55 and I'm looking to buy Downpipes. Which route should I go? AR catless Downpipes Or AR catless WITH RESONATOR downpipes? Who recommends what?
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03-01-2018, 04:11 PM	#3
lsturbointeg Lieutenant General 9153 Rep 14,522 Posts Drives: 2011 535i Jet Black Join Date: Aug 2014 Location: Asian lost in OH iTrader: (0)	agree! Some states have smog emissions so if i was back in Cali i would opt for Catted but being in OH there's no emissions so i'd go Catless in a heart beat! is there emissions in NY? __________________ ~F90Conversion~21"3Piece Forged AvantGardeWheels~KWV1Coilovers~CQUENCE slotted/drilled rotors~GoodridgeStainlesslines~MeisterschaftQuadEx haust~Akrapovic 4"tips~VRSF DP~VRSF CP~TurboSmart BOV~K&N filter~CarbonFiberExteriorComponents~GladenAlphaCo mponents~MatchUp7BMW~Punch P300-12T~ Follow me on Instagram: lsturbointeg
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03-08-2018, 06:44 PM	#4
mike@x-ph.com Joint Chiefs of Staff 24140 Rep 190,687 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	If you are keeping stock turbo, go with catless with resonators. Performance increase is the same as catless and it sounds better __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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03-12-2018, 09:41 PM	#7
NYC535iowner Second Lieutenant 56 Rep 232 Posts Drives: 2013 535i X-drive Join Date: Mar 2018 Location: QUEENS,NY iTrader: (0)	thank you. __________________ 13'- F10--> Work in progress: V-Style front lip, HAMANN roof spoiler, M5 grill, high kick trunk spoiler, H&R sport springs, C-quence Drilled front rotors, VRSF Catless DP, VRSF charge pipe.
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03-13-2018, 07:21 PM	#9
Charter23 Private First Class 76 Rep 175 Posts Drives: 2014 535i xdrive Join Date: Feb 2018 Location: Boston, MA iTrader: (0) Garage List 2012 Toyota 4Runner ... [10.00] 2014 BMW 535i xdrive [10.00]	Just remove your stock downpipe, drill out the catalytic medium, clean it up and reinstall. Done. __________________ ___________________________ 2014 535i xdrive m-sport
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03-13-2018, 11:18 PM	#11
bradsm87 Lieutenant Colonel 595 Rep 1,693 Posts Drives: F25 LCI xDrive30d Join Date: Jun 2013 Location: Australia iTrader: (0)	I wouldn't bother with a resonator that close to the turbo. The packing will be burnt out in no time. It's just too close.
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