N55 catless DP with N54 secondary cats

TylerD · 04-29-2018, 11:01 AM

I was thinking about getting a catted DP from wagner, but read that the gains are less over a catless DP.

Problem is, I would still like to have a cat to prevent fuel smell etc.

So I thought why not take a catless DP for better airflow directly after the turbo and then have the secondary underfloor cats of the N54?

Wouldnt that be the best of both worlds?

Does anyone know the how many cells the original underfloor cats have?

Thanks alot!

HyeWarrior · 04-29-2018, 02:07 PM

I actually thought about doing this too lol. Funny because most people with N54 want the N55 midpipes, not the other way around

TylerD · 05-02-2018, 12:43 AM

Anyone else having thoughts on this?

Eyeman · 05-04-2018, 09:30 AM

I have an N54 with catless DPs and I still have my stock midpipes. Still have a tad of smell, but less I'm sure. Seems a good strategy to me.

04-29-2018, 11:01 AM	#1
TylerD Private 22 Rep 43 Posts Drives: 135i Join Date: Oct 2016 Location: Germany iTrader: (0)	N55 catless DP with N54 secondary cats I was thinking about getting a catted DP from wagner, but read that the gains are less over a catless DP. Problem is, I would still like to have a cat to prevent fuel smell etc. So I thought why not take a catless DP for better airflow directly after the turbo and then have the secondary underfloor cats of the N54? Wouldnt that be the best of both worlds? Does anyone know the how many cells the original underfloor cats have? Thanks alot!
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04-29-2018, 02:07 PM	#2
HyeWarrior Major 747 Rep 1,120 Posts Drives: 2012 135i DCT Join Date: Aug 2010 Location: San Dimas, CA iTrader: (1)	I actually thought about doing this too lol. Funny because most people with N54 want the N55 midpipes, not the other way around
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05-02-2018, 12:43 AM	#3
TylerD Private 22 Rep 43 Posts Drives: 135i Join Date: Oct 2016 Location: Germany iTrader: (0)	Anyone else having thoughts on this?
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05-04-2018, 09:30 AM	#4
Eyeman Colonel 122 Rep 2,040 Posts Drives: 2008 135 blk, blk, step Join Date: Jan 2009 Location: Atlanta, GA iTrader: (0) Garage List 1994 Porsche 968 Cab [0.00] 2017 AMG GTS [0.00] 1994 Porsche 968 Coupe [0.00] 1977 Mercedes 450SE ... [0.00] 2008 135 [8.00]	I have an N54 with catless DPs and I still have my stock midpipes. Still have a tad of smell, but less I'm sure. Seems a good strategy to me. __________________ Injen, RR OCC, MadDad Whisper, donut spare, 19x8.5et43fr 19x9.5et45r Volk LE37's, rear fenders rolled/pulled, PSS4S 225/35fr 255/30r, KW V1's, AR coated catless dps, Cross strutbar, CF grills and license plate holder, iCarbon diffuser, ETS black anodized FMIC, M3 control arms, Quaife, ER chargepipe, ForgeDV's, Topspeed Custom Tune, V3sims, Braille, Andrey_GTA rear hub mod, Ebay Mstyle front bumper and performance style side skirts.
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