[TacticalGunnarM550]

Just a quick post to see if anyone has or knows any downpipes that won't throw a CEL, i purchased an expensive extended warranty recently or else I'd tune and not worry about it.

[Boosted_8]

You can remove the secondary cat to get a bit more sound and performance without CEL. Primary cat is a bit more involved.

[TacticalGunnarM550]

Originally Posted by Boosted_8

You can remove the secondary cat to get a bit more sound and performance without CEL. Primary cat is a bit more involved.

Was hoping for something like this
https://x-ph.com/stone-exhaust-bmw-b...0-340-440-540/

[I3LaZeN]

Originally Posted by TacticalGunnarM550

Was hoping for something like this
https://x-ph.com/stone-exhaust-bmw-b...0-340-440-540/

Damn thats a lot. You better off going Catless and either put back the stocks for emissions/inspection lol

For NY, i was told you can 1 thing not ready, and the catless is not ready so you should pass. I'll find out soon.

[Boosted_8]

400 cell options are on the market for the M5. They use the GESI cores for guaranteed no CEL. They cost quite a lot and are a big job to fit. For someone who doesn’t want to maximise the benefit of aftermarket cats by not tuning and in turn not impacting warranty status, the question why bother comes to mind…

[TacticalGunnarM550]

Originally Posted by I3LaZeN

Damn thats a lot. You better off going Catless and either put back the stocks for emissions/inspection lol

For NY, i was told you can 1 thing not ready, and the catless is not ready so you should pass. I'll find out soon.

I'm not concerned about passing the inspection, i just don't want a CEL, and don't want to tune yet. I'm probably just going with a full Remus cat back anyway but I was thinking of adding a catted downpipe as well.

[I3LaZeN]

Originally Posted by TacticalGunnarM550

I'm not concerned about passing the inspection, i just don't want a CEL, and don't want to tune yet. I'm probably just going with a full Remus cat back anyway but I was thinking of adding a catted downpipe as well.

Got ya. Yea i'd just say go for tune to get the full potential of the downpipe, even if its the OTS tune.

[TacticalGunnarM550]

Originally Posted by I3LaZeN

Got ya. Yea i'd just say go for tune to get the full potential of the downpipe, even if its the OTS tune.

My only issue with a tune was the $3500 extended warranty i purchased 3 weeks ago🤣.

[I3LaZeN]

Originally Posted by TacticalGunnarM550

My only issue with a tune was the $3500 extended warranty i purchased 3 weeks ago.

You can always flash back to stock if you gotta take it in.

[TacticalGunnarM550]

Originally Posted by I3LaZeN

You can always flash back to stock if you gotta take it in.

But it's detectable correct?

[cdavis93]

Are you going for catless or catted?

You can check out (just naming a few here) RedStar, Stone, AWE. They sound amazing. I believe it should not void your warranty but you could do a check with them on it to be sure.

[tampaM550]

I ordered the ARM post cat O2 spacers as a lot of people have had great success with them not throwing a code with a piggy back (JB4) and catless downpipes. That's how I'm running the car with the extended warranty.

[Ron1n]

Originally Posted by Boosted_8

400 cell options are on the market for the M5. They use the GESI cores for guaranteed no CEL. They cost quite a lot and are a big job to fit. For someone who doesn’t want to maximise the benefit of aftermarket cats by not tuning and in turn not impacting warranty status, the question why bother comes to mind…

High flow cats are the way to go if you don't want to mess with spacers. Catless provide you a lot more options, however, and if you're going to go with downpipes, a Stage 2 tune will ultimately follow.