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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catted Down Pipes



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      09-23-2018, 02:35 PM   #1
raptorman5174
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Catted Down Pipes

I have been searching for a while and haven't found exactly what i am looking for. I need to know if there is a company that makes CARB legal High Flow Catted down pipes. From the search I have done below are the three options that i am looking at. I would really like to know the thoughts of the community. The car in question is a 2007 335i n54 E92 and currently has catless down pipes and I need to make her legal again but with an eye on performance. I also added a stock set off of ebay strictly for a price point perspective.

https://www.ecstuning.com/b-turner-m...000932tms01~a/

https://www.cobbtuning.com/products/...tted-downpipes

https://www.ecstuning.com/b-ar-desig...01-01002-sil~/

https://www.ebay.com/itm/2007-2013-B...ry!07726!US!-1

https://www.ebay.com/itm/2007-2011-B...ry!07726!US!-1

Last edited by raptorman5174; 09-23-2018 at 08:28 PM..
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      09-23-2018, 03:18 PM   #2
White330
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The only CARB legal downpipes are the OEM ones. An option would be to gut some OEM ones and run the DP fix, but besides that there isn't any reputable shop that will smog it with aftermarket DP's even if they're catted.
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      09-23-2018, 04:25 PM   #3
Silent9n54
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dont waste your money on catted downpipes

catless and run dp fix or stay oem
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      09-23-2018, 05:37 PM   #4
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I have the AR ones, they just throw codes after a few months like you have catless and then you have to do dp fix anyway, so not worth spending a dollar on aftermarket cats.
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      09-24-2018, 10:46 AM   #5
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Don't bother.
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      09-24-2018, 10:48 AM   #6
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No such thing as CARB legal aftermarket Catted Downpipes.

That being said if you have a catted downpipe and it has no CEL, it should still pass inspection in most states.

CARB is only for California. California Air and Resources Board. In California, especially nowadays almost nothing is legal. Waiting for them to ban human's breathing....
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      09-24-2018, 12:58 PM   #7
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What's the "fix"?
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      09-24-2018, 01:56 PM   #8
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Quote:
Originally Posted by aznbo187 View Post
What's the "fix"?
Leave them alone.
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      09-24-2018, 02:47 PM   #9
raptorman5174
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Thanks for the response guys, so as of right now I am deciding between the COBB or the Tuner DP's. I have a JB4 tune so the software should help me with the codes.
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      09-24-2018, 04:50 PM   #10
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
No such thing as CARB legal aftermarket Catted Downpipes.

That being said if you have a catted downpipe and it has no CEL, it should still pass inspection in most states.

CARB is only for California. California Air and Resources Board. In California, especially nowadays almost nothing is legal. Waiting for them to ban human's breathing....
this is incorrect. CARB is for california or states that follow CARB rules. For example 15 other states like New York and New Jersey follow CARB rules.

to the op,

yes as others stated aftermarket cats are waste since no one is going to spend the money to become CARB certified.

you can just put back the oem ones when you need to smog, but it does get expensive if your paying a mechanic to uninstall and reinstall every 3yrs.
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      09-24-2018, 05:18 PM   #11
Jeff@TopGearSolutions
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Quote:
Originally Posted by TemjinX2 View Post
this is incorrect. CARB is for california or states that follow CARB rules. For example 15 other states like New York and New Jersey follow CARB rules.

to the op,

yes as others stated aftermarket cats are waste since no one is going to spend the money to become CARB certified.

you can just put back the oem ones when you need to smog, but it does get expensive if your paying a mechanic to uninstall and reinstall every 3yrs.
Yes and no.

The 15 other states that follow CARB rules only follow the definition of emissions standards set by CARB.

However, their protocol for inspection differ a lot state to state.

I'm not going to get into the debate of what states do what or what you can get away with for liability purposes.

But let's just say there are states that some things you can get away with legally through loop holes and some states that you can't.

1 example is in some states as long as your vehicle passes OBD inspection and readiness, there is no sniffer or no visual inspection. In this example, that state may in fact be part of CARB but the inspection differs greatly compared to California inspection.

So for all intents and purposes here, as long as the OP doesn't live in CA or a state with strict inspection such as sniffer/visual, he may be able to get away with a high flow catted downpipe so as long as he passes OBDII inspection.

If he is still looking for a CARB legal catted downpipe it will not exist unless it's the OEM catalytic converter for this platform, at this time.

Magnaflow does make some 48 49 and 50 state legal catted headers/downpipes but not for this platform, yet.

Last edited by Jeff@TopGearSolutions; 09-24-2018 at 05:24 PM..
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      10-15-2018, 07:33 PM   #12
raptorman5174
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hey guys just an update to close out this thread, i have decided to keep my car as is with the AR catless Dp's. Especially since I just found out that the coupes have a second set of cats under the car.

Go Figure
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      10-16-2018, 05:20 PM   #13
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Quote:
Originally Posted by raptorman5174 View Post
hey guys just an update to close out this thread, i have decided to keep my car as is with the AR catless Dp's. Especially since I just found out that the coupes have a second set of cats under the car.

Go Figure
Yes, they do, although they are not monitored by the vehicle or required by law.
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