Do downpipes throw a CEL?

vegasspeed · 07-27-2008, 02:14 PM

I was thinking of getting these with hi-flow cats and wanted to know if they throw a check engine light after they are installed. Anyone? Anyone?

Panoz · 07-27-2008, 02:19 PM

Hey vegasspeed!!!
Catless DPs will surely throw codes.
If you install catted DPs will NOT induce any Limp modes or CEL

We've tested both cases in similar cars/mods and the catted ones worked perfectly without O2 Sims

07-27-2008, 02:20 PM

I was thinking of doing the same thing, won't it void dinans warranty maybe?

vase330 · 07-27-2008, 02:27 PM

Yup, GameOver for Dinan guys...

vegasspeed · 07-28-2008, 12:29 AM

Here is the thing. Will hi-flow cats throw any codes? If not I can pull them out when I need to bring the car in for service and still be good, right? Yes, I do know that would be an absolute pain in the ass to take out and put in. I am just looking at things.

vase330 · 07-28-2008, 12:35 AM

How much time and how much if you take it to muffler shop?

rideelement247 · 07-28-2008, 01:07 AM

Sometimes they do throw codes. I remember some people throwing errors and getting royally pissed about paying extra and still inducing CELs. Best thing to do is to grab a set of O2 Simms just in case and make sure you don't mess up the order of the O2 sensors(precat vs postcat). It may also take a while to throw a code - usually 50 miles is the car's driving cycle where it analyzes a change as a permanent malfunction of the cats. If you have an early 07 build with no progman updates you should be fine. But now most people are not in this area and would probably throw codes.

nj335i · 07-28-2008, 09:35 AM

If you have a tune, you will have a higher chance of throwing a CEL with catted DPs.

07-27-2008, 02:14 PM	#1
vegasspeed Captain 84 Rep 761 Posts Drives: 335i 6MT coupe Montego Blue Join Date: Apr 2008 Location: Las Vegas iTrader: (1)	Do downpipes throw a CEL? I was thinking of getting these with hi-flow cats and wanted to know if they throw a check engine light after they are installed. Anyone? Anyone? __________________ 335i coupe Montego Blue Dinan stage 3 tune, Advan RS wheels 350whp/365wtq 1994 Brooklands Green Acura NSX Comptech Supercharged 390whp/300wtq
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07-27-2008, 02:19 PM	#2
Panoz Lieutenant Colonel 87 Rep 1,575 Posts Drives: E92 Space Grey 335i ,Aero Kit Join Date: Nov 2006 Location: EU iTrader: (0)	Hey vegasspeed!!! Catless DPs will surely throw codes. If you install catted DPs will NOT induce any Limp modes or CEL We've tested both cases in similar cars/mods and the catted ones worked perfectly without O2 Sims __________________ Procede V4 , Catless DPs, Forge FMIC, Injen Intake, VK Oilcooler, Hartge Quads Exhaust, Modded CDV, Synapse BOV Kit, BMW Performance 335i SSK Kit, P3 vent boost gauge Space Grey 335i -> See more pics HERE
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07-27-2008, 02:20 PM	#3
amazzzin Guest 0 Rep n/a Posts Drives:	I was thinking of doing the same thing, won't it void dinans warranty maybe?
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07-27-2008, 02:27 PM	#4
vase330 Colonel 103 Rep 2,760 Posts Drives: 19 E63S; 15.5 RangeRover ATB Join Date: Jan 2007 Location: Arlington, Va iTrader: (1)	Thought of same thing but if you have Dinan, GameOver! (pun-intended) Yup, GameOver for Dinan guys... __________________ E92 335 \| Space Gray \| Saddle Brown Dakota \| Dark Burl Trim \| ZPP \| ZSP \| AT \| Idrive \| 6FL \| FBO \| Dinan CAI \| Quaife LSD \| STG3 PROCede.
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07-28-2008, 12:29 AM	#5
vegasspeed Captain 84 Rep 761 Posts Drives: 335i 6MT coupe Montego Blue Join Date: Apr 2008 Location: Las Vegas iTrader: (1)	Here is the thing. Will hi-flow cats throw any codes? If not I can pull them out when I need to bring the car in for service and still be good, right? Yes, I do know that would be an absolute pain in the ass to take out and put in. I am just looking at things. __________________ 335i coupe Montego Blue Dinan stage 3 tune, Advan RS wheels 350whp/365wtq 1994 Brooklands Green Acura NSX Comptech Supercharged 390whp/300wtq
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07-28-2008, 12:35 AM	#6
vase330 Colonel 103 Rep 2,760 Posts Drives: 19 E63S; 15.5 RangeRover ATB Join Date: Jan 2007 Location: Arlington, Va iTrader: (1)	Depends on how much effort it is to take them out. How much time and how much if you take it to muffler shop? __________________ E92 335 \| Space Gray \| Saddle Brown Dakota \| Dark Burl Trim \| ZPP \| ZSP \| AT \| Idrive \| 6FL \| FBO \| Dinan CAI \| Quaife LSD \| STG3 PROCede.
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07-28-2008, 01:07 AM	#7
rideelement247 Lieutenant Colonel 61 Rep 1,677 Posts Drives: 08 335i, 67 Camaro SS Join Date: May 2007 Location: South Florida iTrader: (2)	Sometimes they do throw codes. I remember some people throwing errors and getting royally pissed about paying extra and still inducing CELs. Best thing to do is to grab a set of O2 Simms just in case and make sure you don't mess up the order of the O2 sensors(precat vs postcat). It may also take a while to throw a code - usually 50 miles is the car's driving cycle where it analyzes a change as a permanent malfunction of the cats. If you have an early 07 build with no progman updates you should be fine. But now most people are not in this area and would probably throw codes. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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07-28-2008, 09:35 AM	#8
nj335i Modaholic 97 Rep 1,707 Posts Drives: with 3 pedals Join Date: Jan 2007 Location: East Coast iTrader: (7)	If you have a tune, you will have a higher chance of throwing a CEL with catted DPs. __________________ Euro Delivery - April 2007
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