I believe it is welded on.




Sorry couldn't help myself. Are you talking about flow, quality, emissions, looks or how it is actually attached 😂

 

Ha haha. Sorry. Yeah for flow, power gains, emissions and quality. I've dealt with cobb in the past and I have nothing but good things to say about them.

 

High flow...I'm sure catless would yield better results but with cat I pass the cars self tests

 

Based on the Cobb reivew of the newer dp, it looks pretty nice. Its actually a full 3" dp this time around. It even has fancy flanges. In terms of power, when compared to catless, will the loss is minimal. The differance between the 2 would be somewhere like 5-10whp if that on your average stage 2 sti. Something along those lines i think or atleast thats how it was on their older regular catted downpipe.

I wonder how long these cats will last? I guess time will tell to see how good these catted dp's are.

 

The GESI cats are mostly to meet emission compliance. They are quite nice. We have them in stock if you need one.

 

The GESI cats are mostly to meet emission compliance. They are quite nice. We have them in stock if you need one.
[/QUOT
What's your msrp on the dp?

 

There's no way around it, cats reduce flow potential. Many variable dictate flow and limitations, but generally, the higher the gas flow through them, the higher the losses. At 300whp, you may loose 5whp, and at 500, 25whp. It scales up with power.

Gesi cats are a nice balance, but there are better units out there, and certainly worse. I think the market just doesn't support a $2,000 catted downpipe that will support 900hp, and $100 cats are not efficient enough to make big brother happy. The gesi strikes a reasonable balance for the meat of the stage 2 cars where the catted impact on power is not going to be very significant.

 

I think the market just doesn't support a $2,000 catted downpipe that will support 900hp

Just out of curiosity is there a cat out there in the market that could support 900hp (knowing it could be stupidly expensive)?

 

I was wondering, has there been any controlled testing of a GESI catalytic converter vs. a “regular” one in terms of power output?

 

As in vs OEM? Even if the cat was horrible, moving to a bellmouth and 3" design is going to give you good gains. To know the benefits of the Gesi vs OEM (or others) it needs to be on the same setup.

 

Well, for example, MAPerformance offers their downpipe with a GESI and “high flow” and I have seen others with different catalytic converters options. I have always assumed this is to keep up with California but my question is regarding performance. Given an individual is already going to run an aftermarket down pipe, is there a difference in the converters from a performance standpoint? Sorry if the first question was unclear.

 

I don't think the power loss for the regular user is worth going against emissions standards. Most, if not all cats out there on a well tuned car will pass emissions, however, the real game here is about any certification that may or may not come with it, not the actual tail pipe emissions. At this point, I don't think they should have any emission testing facilities outside of an OBD check, since you can make a car pass the sniffer without any emissions equipment on the car.

 

I agree. Any advantages or disadvantages with a divorced dp? Right now I'm stuck between the Cobb GESI and the Grimspeed divorced dp. Both offer a catted full 3" dp

 

How do you feel about the grimspeed divorced 3" dp?

 

Any advantages or disadvantages with a divorced dp?

 

Thanks I appreciate it.

 

Nevermind I just realized that the Invidia dp w/ high flow cat is just about $900 so the Cobb comes in cheaper at $735. That kinda surprises me but cool. Im going with Cobb's dp, don't think I'll be disappointed. Next will be the AP

 

Cobb recently posted on FB that they are working on a “unique” downpipe for the 19+ STi

 

9/8/21
I was just told they’re working on it
I just picked up a 2020 sti and I’ll have to settle for catback for now.
Hayward & Scott

 

Just spoke with COBB and the "19" downpipe they are working on is to meet stricter emissions for the newer cars.

 

Ok that’s what I had read somewhere - thanks for confirming!

 

I always wondered how a cat would hold up on my car I'm catless right now and the next time I tune my car I may switch it over to a catted downpipe. It makes 430 at the wheel with a meth kit how would a cat survive and would I only lose 10-20 HP?

 

A high performance cat would survive just fine. They are available to handle +1,200hp if need be. Keep in mind they are very much a get what you pay for product. A $600 High Flow HJS cat is going to be more efficient and flow much better than a $200 cat. The manufacturing process, materials, coatings, etc., just make it impossible to make an inexpensive cat that works as well as high dollar version. Like many things in life, you get what you pay for.

It's great that Cobb is giving a go at a CARB version. There are a lot of factors to weight when going down that road, and it is a very expensive and time consuming process.

 

Anyone on this thread or following actually runing the Cobb GESi on a 2019+ STI and if so please chime in.
I just had the following reply from Cobb Support regarding my inquiry into downpipe fitment for 2019+ STI's. Seems like the left and right hands might not be in sync??

Aaron Foo (COBB Support) Sep 10, 2021, 11:14 AM CDT Good morning, Thank you for reaching out to COBB Support! Let's get you some answers! At this time we are currently in the process of testing a new catalytic converter for the downpipe in the 2019-2020 STI models. These models do have a different internal emissions system and as such our current downpipe will not work with it. Currently, we have no ETA on when this will be available but if you subscribe to the updates below you will be informed of all the Subaru updates including when the new downpipe is launched: Click here to subscribe to email updates for your car While the other ones will FIT they will cause the emissions system CEL's to appear Please let me know if you have any other questions and I would be happy to assist!

 

Anyone on this thread or following actually runing the Cobb GESi on a 2019+ STI and if so please chime in.
I just had the following reply from Cobb Support regarding my inquiry into downpipe fitment for 2019+ STI's. Seems like the left and right hands might not be in sync??

IDK on the Cobb reply, but we have a shop 19 STi running our HF HJS cat setup, but it is ProTuned. Nothing different from past cars that I recall, but maybe they are trying to meet an improved emissions standard (CARB) that began in 2019? Or get it to work (pass emissions) on stock and stage 1 OTS maps?

 

I will be having my 'Cobb SS 3" GESi downpipe' installed on my 2020 STI on Monday, September 13. It will also be pro-tuned.

I don't understand what you mean when you say it won't fit. It will definitely fit because its the same engine.

I think what Cobb meant when they said it won't work is that you can't slap it on and use their stage 2 map that is suppose to include their downpipe.

 

I never said it wouldn't fit, in fact I was trying to verify through Cobb support that it would in fact "physically" fit, which I fully assumed given the car had not changed in 5+ years. Fitment is more a reference to the Cobb Fitment guide on their website where you input Brand/Make/Model/Year and they show you available parts that fit your specific application. Plugging in an STI 19+ the Downpipe is no longer listed on the available parts page. Yes, Cobb's Stage 2 OTS map for 2019+ most likely does not have support for the down-pipe, and by taking the stance they did it is a way for them to Not have to support it.
Most likely Killer B nailed it with his response.
Below is the exact question I sent to Cobb Support. Just some interesting banter nonetheless.

Sep 10, 2021, 10:23 AM CDT

Good Morning Cobb Support

I Have a question I am hoping you can answer. So what exactly is it about the Subaru GESi Catted 3" Downpipe STI 2008-2018, WRX 2008-2014, FXT 2009-2013 that would cause fitment issues on STI model years 2019 and up?

I am pretty sure I have come across a handful of 3rd party vendors whom market the same downpipe (based off part #) for 2019+ STI's?
I am sure that is Not supposed to be happening, but can the part work for the newer cars with supporting mods (injectors + fuel pump + pro tune) or is there a physical difference in the 2019 STI vs 2018 STI and earlier VA's?

Any info you have on this would be great and if something is in the pipeline that you support down pipe wise for the 2019+ cars.

Regards

 

I don't even understand why youre asking this question then. You said you already knew the downpipe fits on 2015+ STI.

2019-2021 STI has a different emissions tune and lay out which affect the mapping. Therefore Cobb's OTS stage 2 maps work for 2015-2018 and not 2019+ STIs. Cobb's answer to this is that they are researching and developing a new downpipe for 2019+ STIs that meet new emissions requirements. They arent going to tell you the "old" one works because they dont have an OTS map that tunes for it, which could be damaging to your engine, and could eventually be failing emissions, which is a big reliability for them.

 

Hahaha...I asked the question hoping that someone like yourself would respond with insightful/informational replies...so I most certainly succeeded.
Thanks for all the help! You are an asset to this community.

 

That is correct, I believe the went back 8 model years.

 

Thanks for confirming...and also DAH Fuq?
So I guess I am not buying a COBB DP for my car.

 

It's all about appeasing the EPA and staying in business. They are working on alternatives and other solutions, but also working really hard to be able to keep producing parts for the likes of us.