Catless down pipes

[Petersl63]

Does anyone have any idea how to install catless downpipes without getting a code or check engine light or if it is even possible?

[templarklimek]

going catless will require a tune. Not just to remove the CEL error but to take full advantage of downpipe.

[bigbrian]

As with any performance modification tuning the car will get the most out of the mod -- but it's not required.

You will free up the exhaust allowing the turbos to 'spin up' faster and the sound through the exhaust will be amazing. As for the CEL you are going to be stuck with that for now as there are no hacks/fixes/coding that can be done to remedy it. PP-Performance has 'software' to remove the CEL but it depends where you are located otherwise you have to ship them your DMIs (or ship them your car).

I have catless downpipes on my car (I love them) and would never go back to catted downpipes. At first I was so worried about the CEL but after you hear the turbos spin up and spool down through the exhaust pipes you will soon give a shit less about the CEL.

Brian

[Roadrage]

+1 with Brian,I still have stock exhaust on my car for now but the catless down pipes still sounds amazing and you can hear the turbo's so much better.

[wrsbmw]

Originally Posted by Roadrage

+1 with Brian,I still have stock exhaust on my car for now but the catless down pipes still sounds amazing and you can hear the turbo's so much better.

So I take it that in Virginia they aren't checking emissions on state inspection? Maybe that is because everyone is required to drive 55 still or go to jail? That is a strange combination, don't care about emissions but nazi enforcement of speed limits.

[EuroKar]

Originally Posted by Petersl63

Does anyone have any idea how to install catless downpipes without getting a code or check engine light or if it is even possible?

You cant take advantage of catless downpipes without a proper tune.
Your check engine light will be on. You will not know if your engine develops another issue because your light will already have been on.
Your lambda control will not be correct because of the ECU's trying to figure out why the rear oxygen sensors are reading off the charts.
Its up to you what you want to do. Does it sound cool with them ? Yes.
Is it good for your engine ? No
You should call software tuners and get their honest opinion on this.
Exhaust companies will tell you to buy their product to have a sale.
They are not the software engineers that develop and monitor the operating values while creating a software tune.
Good luck
Just my opinion on the subject

[Roadrage]

wrsbmw yeah Virginia do have some crazy laws and I am pretty sure catless downpipes are against emission laws. I just got lucky the car was new and I guess they didn't really inspect the car just slapped the inspection sticker on.

[wrsbmw]

Originally Posted by Roadrage

wrsbmw yeah Virginia do have some crazy laws and I am pretty sure catless downpipes are against emission laws. I just got lucky the car was new and I guess they didn't really inspect the car just slapped the inspection sticker on.

Ah, OK. I think you might have an issue the next time your sticker comes up. New cars in Texas get a two year sticker so I could have done catless and then next May have to deal with it. My SA told me he had one guy with a M3 that runs catless and that guy gets the pipes replaced to pass inspection and then puts the catless back on every year. That is $2000 worth of BMW labor each year so he can run catless. I can't see it, thus I opted for the Noelle's which won't fail inspection but did come at a high cost, $4500. They sound great and they also work within the Dinan Tune parameters because Steve Dinan has them on his car.