[KG3356MT]

Hi everyone. quick question....I was interested in some race land down pipes for my 335i. I was wondering how so many forum members run catless DP's without throwing a code? am I missing something? Any feedback would be great. thanks.

[JKim89]

i think u need a o2sim fix for catless dp?
i also think bms sells them

[EYE4SPEED]

Can you put dummy sensors in the bungs or have that reprogrammed with your tune?

[JKim89]

i dont really know =S
i was looking to put catless dp but i heard it needs o2sim and it might now pass the co2 emission thing? so i thought i would take it a little slower.
i think it's best if you ask the N54/N55 exhaust section

[ceb]

What is the draw of catless systems? There are no significant performance gains and only downsides - emission issues, warranty issues and driveability problems.

All this for bragging rights that you are running illegal downpipes on your car.

[Quasimodem]

Originally Posted by ceb

All this for bragging rights that you are running illegal downpipes on your car.

Aren't most exhaust mods sort of "cosmetic" for the "note"? Even if I didn't drive a diesel I wouldn't be able to hear the engine over my stereo, so obviously I would never do anything like this.

[GTiceman]

if you have a tune that can clear codes like the JB4 you shouldn't have a problem

[JDLM]

or even posting in the correct section vs the general areas would yield better results or searching more.

[Toker335i]

Originally Posted by ceb

What is the draw of catless systems? There are no significant performance gains and only downsides - emission issues, warranty issues and driveability problems.

All this for bragging rights that you are running illegal downpipes on your car.

No you brag because you have illegal downpipes and you have 6-7whp more then the guy with the catted pipes

[Bodie217]

catless dp's are for those of us that also run no front plates, illegal tint, and drive the piss out of our cars.
If catless dp's don't make sense to you now, they never will, so don't get them.

[pits200]

What happens when you need to take your tune out and still have the catless dps in. Wouldn't it have a code if you need to take the car in for warranty work..

And yes I know that you need to pay to play but my dealership is decent about they would be fine with it.

[Mahhvinn]

Catless DP's will throw codes unless you have the o2sim fix from BMS or a Tune that can delete the Error codes.

If you're worried about warranty and installation and don't think that you will have any gains then don't bother getting them. Either get the catted version of DP's or just run your stock pipes.

[cstmx_ryder]

And those who wants to 5hit on their warranties.........

Originally Posted by HomeRun217

catless dp's are for those of us that also run no front plates, illegal tint, and drive the piss out of our cars.
If catless dp's don't make sense to you now, they never will, so don't get them.

[tibra1]

Originally Posted by KG3356MT

Hi everyone. quick question....I was interested in some race land down pipes for my 335i. I was wondering how so many forum members run catless DP's without throwing a code? am I missing something? Any feedback would be great. thanks.

Every car is different..but generally u need an o2 simm when running catless DPs..I am using BMS v3 with the adjustable dial set at 7PM..so far so good.

Just curious why Racelands? I know they r cheap but I would worry about fiment issues with them..there is literally mms of space between each DP so fitment is essential..I am running w AR designs..they fit like a glove and are really well made..

also racelands are 2.5 inch...ARs are 3 inch... Mr 5 did a dyno of 2.5 vs 3 DPs bigger downpipes = more power.

http://www.e90post.com/forums/showthread.php?t=316974

[tibra1]

Originally Posted by EYE4SPEED

Can you put dummy sensors in the bungs or have that reprogrammed with your tune?

O2 sensor spacers and dummy sensors will not work with these cars..u have to address the issue electronically..hence the o2 simm. some of the piggys have an o2 fix in them I believe..I am running GIAC and they dont

[tibra1]

Originally Posted by ceb

What is the draw of catless systems? There are no significant performance gains and only downsides - emission issues, warranty issues and driveability problems.

All this for bragging rights that you are running illegal downpipes on your car.

No signficant performance gains??? Are you serious..I picked up at least 40 hp going full catless w an intake system.

stock DPs are a major restriction and stress the turbos..especially when you are running a tune or piggy

[tibra1]

Originally Posted by M_Truong

Catless DP's will throw codes unless you have the o2sim fix from BMS or a Tune that can delete the Error codes.

If you're worried about warranty and installation and don't think that you will have any gains then don't bother getting them. Either get the catted version of DP's or just run your stock pipes.

Dont bother with Catted DPs..either go catless DPs or just leave your stock DPs

[Toker335i]

Originally Posted by tibra1

Dont bother with Catted DPs..either go catless DPs or just leave your stock DPs

+1

and either way catted or catless they still void your warranty..

and IMHO i really doubt you'll get a ticket for catless dp's, unless your just driving like a maniac and asking for attention and the cop checks your whole car front to back haha.

[tibra1]

Here is a pic of my AR design Dps installed..my advice dont skimp on the Dps..AR are choice DPs

[JB335]

Why do you guys keep saying if you have a flash that has a DP fix you'll be okay? Whether it's GIAC, COBB or another you will need to be flashed back to stock so the dealer doesn't see the tuned software. When you do that you're losing the custom DP fix. So it will throw the code on the stock ecu software.

Sometimes I feel like people ignore the obvious because it's not what we want to hear.

If you have a piggyback tune that deletes error codes it will throw the code once you pull the tune out for the dealer visit.

Really the only way around this problem is to keep a DP fix installed in the ecu compartment and hope that the dealer doesn't go digging in the engine bay.

[tibra1]

Originally Posted by Toker335i

+1

and either way catted or catless they still void your warranty..

and IMHO i really doubt you'll get a ticket for catless dp's, unless your just driving like a maniac and asking for attention and the cop checks your whole car front to back haha.

Guys in strict emission states like Cali..have to worry about enforcement...luckily for me I have florida plates..no inspection at all in Florida..

LOVE THAT..

[tibra1]

Originally Posted by JB335

Why do you guys keep saying if you have a flash that has a DP fix you'll be okay? Whether it's GIAC, COBB or another you will need to be flashed back to stock so the dealer doesn't see the tuned software. When you do that you're losing the custom DP fix. So it will throw the code on the stock ecu software.

Sometimes I feel like people ignore the obvious because it's not what we want to hear.

If you have a piggyback tune that deletes error codes it will throw the code once you pull the tune out for the dealer visit.

Really the only way around this problem is to keep a DP fix installed in the ecu compartment and hope that the dealer doesn't go digging in the engine bay.

Thats the exact reason I waited for 4 years b4 modding..no warranty anymore..so no worries