Hi everyone,

I bought remus cat back exhaust system, Dinan Elite Tuning Kit, and planning to buy Miltek Downpipe decat. Anyone have this kind of setup and cross problems with engine light after putting the downpipe? Should I get a spacers as well?

Many Thanks,

 

I just installed a Milltek catless DP on Friday! The reason was because they promise you wont get a CEL and so far I havent had one. No spacers are needed because it is already spaced.

I dont think the Dinan would cause a CEL for the air flow.

 

​​​​​​​Thank you for your quick response Vinnie! Sounds like I will go for it.


Cheers

 

Always glad to help! Im pretty amazed at the difference it makes. Heres my writeup if you are interested:

https://myredmini.com/milltek-catless-downpipe/

If anything for peace of mind call Dinan and ask. They have incredible customer service. I called them about a setting when I had the sport and ended up talking cars for about 45mins with them.

 

Thanks man. Nice Write up dude. Excited to see the difference and curious how bad the smell is inside the car after decat.

 

Thanks!

No smell at all and its -7 here so I have the heat on max and havent smelled one thing

 

Just give it a couple days. Milltek does not promise you will not get a CEL. Running that downpipe I would get a CEL after around 40-50 miles guaranteed.

OP - I'm 99% certain you will get a cel running this downpipe.

 

Correct me if I'm wrong (don't have a downpipe), but on this and on the Gen2 forums the installation of a downpipe is for sound, not performance. Why would a CEL come on? I think some have had it come on with the Dinan tune box, but that makes more sense. There's a whole separate thread about that.

 

The DP has an 02 sensor before and after the cat. If it doesn't see the difference between the two that it's looking for it will throw a CEL. Obviously with the catless DP it won't see that difference. The spacer is supposed to somehow fool the ECU and not cause a CEL. This mod is not just for sound. The reduction in back pressure along with other mods results in more power. If you have an ECU tune like the ByteTronic they can tell the ECU to ignore the CEL conditions. Can't guarantee it'll pass emissions testing if you're unlucky enough to require that.

 

I guess its hard to say because I have a friend who has your/my DP in for 2+ years now and never got one. That's primarily the reason I wanted a Milltek was for that

 

I'm going with the Milltek because of the reviews I've read, especially concerning the fit without needing to be jacked around or modified like some others. And, Milltek is known for their quality products.

When are you gonna upgrade your I/C Vinnie? That's about all you have left to do engine wise.

 

Oh yeah, I remember the guy who did my Stage 1 ECU tune said that in order to get his Stage 2 tune I'd have to get a downpipe ahead of time or something similar.

 

Ha, it's on the to-do list for sure. I keep watching that thread that is selling a Forge one daily.

 

I would say the Milltek and the Dinan are a good set up and if you have an issue, they or we are here to help.

 

So Vinnie. No CEL on the DP catless 6 mos later?

Considering Milltek. Catless. But the CEL would drive me crazy. So there's no port for the oxy sensor? How does that work?

And should you run colder plugs on a catless DP? Even without a tune?

Thanks

 

I got mine coded out when I got my ByteTronik tune flashed.

There is a bung for the sensor, it’s the long tube sticking out from the bend

 

what's a bung? a plug?

so basically a tune will prevent the CEL

 

Do you use the colder plugs because of the catless DP or because of the tune?

 

The bung is where the O2 sensor screws into.

Yep, I used colder plugs because it was recommended with my tune.

 

Yeah. Got the whole rundown. CEL happens with the de-CAT DP no matter what. Even CAT DPs that are not OEM. Tune tricks it out. Bung hole no matter. hahaha Basically the car is ECU or software based - so any serious change in the oxygen or fuel ratio / mixture needs to be addressed with a tune or re-map of the ECU. That Byte guy is down in Austin. Lots of tunes out there. Everyone is sellin 'em lol Manic, Byte . . . <buyer beware>

 

Guess it still comes down to whether you are required state / county emissions testing. You can use a tuner to "ignore" the condition causing the CEL (missing O2) or turning off the sensor, but if/when you go to emissions testing, all sensors must be functioning and in "READY" state. No CAT(s) = No Pass. Did I mention Maryland emissions stinks.

 

yep

 

 

Nope. You will need to get a custom tune with it coded out