Cobb OTS tune for a '15 STi with only a downpipe?

MJ26gaming · 01-12-2022, 02:22 PM

Hello! I recently acquired a 2015 STi, and one of the previous owners had upgraded the car to a "stage 2," then was brought back to near stock by a Subaru dealer, according to the dealer we bought it from. One of the modifications left in, apparently, was the downpipe. From my nose-analysis, it smells like a non-catted downpipe. I haven't been able to get it up on a lift yet to see the downpipe, but I did get under to assure the cat-back was stock. It was.

My question is, is there a Cobb OTS tune that would work well for this car? I asked my cousin who has had a few subies, and he said I should do stage 2. What do you all think?

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cdska · 01-12-2022, 04:38 PM

you should comb over everything on the car to determine what mods it has, and return it to stock, or get a tune that supports the mods your car has

ericsson · 01-12-2022, 05:31 PM

You start off by saying it has an aftermarket down-pipe, but then at the end you say it's is stock.. So which one is it?

Cobb does have a number of OTS maps available on their website. I STRONGLY suggest you read the map notes because their maps are meant for specific supporting mods (brand included). For example, there's an OTS map that supports Cobb air intake specifically, and another that support other non-Cobb air intake vendors.

MJ26gaming · 01-12-2022, 10:17 PM

Quote:

Originally Posted by ericsson

You start off by saying it has an aftermarket down-pipe, but then at the end you say it's is stock.. So which one is it?

Cobb does have a number of OTS maps available on their website. I STRONGLY suggest you read the map notes because their maps are meant for specific supporting mods (brand included). For example, there's an OTS map that supports Cobb air intake specifically, and another that support other non-Cobb air intake vendors.

I said the car was near-stock. The dealer said the clutch and the downpipe we're the only mods left. Based on clutch feel, I'm reasonably confident the clutch is not stock lol.

Jack · 01-13-2022, 08:16 AM

I have never heard of a Cobb OTS tune that supports a catless exhaust. There are tunes they sell that support a Cobb high flow cat. I'd go back to the dealer and make them replace that catless down pipe with a proper catted down pipe. A catless down pipe is NOWHERE near stock. Also, there's a $10,000 EPA fine for dealers who remove the cat or sell a car without the cat, so feel free to let them know that you're more than happy to contact them.

rtv900 · 01-13-2022, 08:36 AM

If it's catless dude then yeah, make them put on a catted one.
The cat removal will net you precisely 2 hp at redline.
No clue why people love deleting cats, just makes the exhaust reek, getting inspections to pass is a living nightmare, and you just needlessly pollute for literally no reason.

Mind boggling that the dealer also indicated to you that they were fully aware of that as well.

Jefe159 · 01-13-2022, 09:52 AM

Determine the model of the downpipe that is on the car. If it smells catless it probably is. The bad news is, no, Cobb does not have an OTS that supports a catless DP. I would not run a OTS Stage 2 tune with anything OTHER than Cobb's downpipe, which is catted.

You should either buy a different downpipe, make the dealer install a stock one, or search for a tuner to offer you a custom tune.

Otherwise the engine may go boom and you'll be sad.

MJ26gaming · 01-14-2022, 07:56 PM

Quote:

Originally Posted by Jefe159

Determine the model of the downpipe that is on the car. If it smells catless it probably is. The bad news is, no, Cobb does not have an OTS that supports a catless DP. I would not run a OTS Stage 2 tune with anything OTHER than Cobb's downpipe, which is catted.

You should either buy a different downpipe, make the dealer install a stock one, or search for a tuner to offer you a custom tune.

Otherwise the engine may go boom and you'll be sad.

It's a catted grimmspeed. I don't know why it smelled uncatted...

01-12-2022, 02:22 PM	#1
MJ26gaming Scooby Newbie Member#: 527914 Join Date: Dec 2021 Chapter/Region: MWSOC Location: KCMO Vehicle: 2015 WRX STi Blue	Cobb OTS tune for a '15 STi with only a downpipe? Hello! I recently acquired a 2015 STi, and one of the previous owners had upgraded the car to a "stage 2," then was brought back to near stock by a Subaru dealer, according to the dealer we bought it from. One of the modifications left in, apparently, was the downpipe. From my nose-analysis, it smells like a non-catted downpipe. I haven't been able to get it up on a lift yet to see the downpipe, but I did get under to assure the cat-back was stock. It was. My question is, is there a Cobb OTS tune that would work well for this car? I asked my cousin who has had a few subies, and he said I should do stage 2. What do you all think? * Registered users of the site do not see these ads.

01-13-2022, 08:16 AM	#5
Jack Add Lightness Moderator Member#: 13699 Join Date: Dec 2001 Chapter/Region: NESIC Location: Hopkinton, MA Vehicle: 2021 Building It Better	I have never heard of a Cobb OTS tune that supports a catless exhaust. There are tunes they sell that support a Cobb high flow cat. I'd go back to the dealer and make them replace that catless down pipe with a proper catted down pipe. A catless down pipe is NOWHERE near stock. Also, there's a $10,000 EPA fine for dealers who remove the cat or sell a car without the cat, so feel free to let them know that you're more than happy to contact them. Last edited by Jack; 01-13-2022 at 11:12 AM.

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01-12-2022, 04:38 PM	#2
cdska Scooby Specialist Member#: 458809 Join Date: Nov 2016 Chapter/Region: NESIC Location: Boston Vehicle: 05 blob, 02 bug	you should comb over everything on the car to determine what mods it has, and return it to stock, or get a tune that supports the mods your car has

01-12-2022, 05:31 PM	#3
ericsson Scooby Specialist Member#: 208672 Join Date: Apr 2009 Chapter/Region: TXIC Location: Houston, TX Vehicle: 2013 WRX STI Limited Obsidian Black	You start off by saying it has an aftermarket down-pipe, but then at the end you say it's is stock.. So which one is it? Cobb does have a number of OTS maps available on their website. I STRONGLY suggest you read the map notes because their maps are meant for specific supporting mods (brand included). For example, there's an OTS map that supports Cobb air intake specifically, and another that support other non-Cobb air intake vendors.

01-13-2022, 08:36 AM	#6
rtv900 Scooby Guru Member#: 428511 Join Date: Aug 2015 Location: philadelphia Vehicle: 2016 STI	If it's catless dude then yeah, make them put on a catted one. The cat removal will net you precisely 2 hp at redline. No clue why people love deleting cats, just makes the exhaust reek, getting inspections to pass is a living nightmare, and you just needlessly pollute for literally no reason. Mind boggling that the dealer also indicated to you that they were fully aware of that as well.

01-13-2022, 09:52 AM	#7
Jefe159 Scooby Newbie Member#: 486182 Join Date: May 2018 Chapter/Region: MWSOC Location: The Nasty Nati Vehicle: 11 STI sparkly fun gray	Determine the model of the downpipe that is on the car. If it smells catless it probably is. The bad news is, no, Cobb does not have an OTS that supports a catless DP. I would not run a OTS Stage 2 tune with anything OTHER than Cobb's downpipe, which is catted. You should either buy a different downpipe, make the dealer install a stock one, or search for a tuner to offer you a custom tune. Otherwise the engine may go boom and you'll be sad.