Catless divorced DP with Cobb stage 2?

**Romdizzle** · 10-10-2012 09:24 AM

Searched and couldn't find much on it but I'm planning on replacing the stock DP with a catless divorced DP. Just wondering if anyone has run into any problems with this setup. Currently have SPT Catback.

**rage-wrx** · 10-10-2012 09:27 AM

How do you plan on tuning the car?

**Romdizzle** · 10-10-2012 09:29 AM

I have a Cobb ap so I was planning on just using the stage 2 map...

**Romdizzle** · 10-10-2012 09:30 AM

Ps I've got a K&N intake as well. Plan on switching to Cobb SF Intake.

**EJ257** · 10-10-2012 09:49 AM

Cobb notes state their map is for downpipes with a HFC only.

**DiRty Impreza** · 10-10-2012 11:55 AM

i run catless DP on my 06 with COBB AP Stage II, No issues. maps designed for a cat, but think cobb states that to cover their @$$. your car though, so whatever you feel comfortable with.

**Mikie13** · 10-10-2012 11:57 AM

Maps for the GR generations are more picky due to the type of ECU when compared to GDs...so it may in fact cause a difference if you don't follow the notes.

**mark012sti** · 10-20-2012 10:35 AM

Hardware Requirements: Stage2+Intake - Otherwise stock vehicle with a one of the
supported intakes listed below., tested with a Cobb Tuning turbo-back exhaust system
with at least one high-flow catalytic converter. An equivalent turbo-back exhaust system could be used. If the
turbo-back exhaust system relieves back-pressure to an excessive point boost creep is possible. If a lesser
flowing turbo-back exhaust system is used then boost targets may not be achievable. The addition of any other
hardware may make the vehicle perform poorly.

I found that on cobbtuning.com. It doesnt really say you need a cat in the downpipe... I was thinking of doing the same thing with my 2012. Still undecided though.. does this mean as long as you have a cat somewhere in your exhast system?? I plan on getting it pro tuned, just not sure when that will happen.

**starkall** · 10-20-2012 12:02 PM

When using the catless dp with the OTS map you might over boost. Especially in cold weather. My car would over boost no matter what wastegate map I used. Some cars and climates are different. It may work for you. Cobb told me it would be ok to use catless with their map but if it over boost i would have to pro tune. I'd just get a pro tune anyways. The OTS maps are mediocre in my opinion but better than stock.

**mark012sti** · 10-20-2012 12:46 PM

Ok that makes sence. Thanks for the info man

I plan on getting pro tuned anyways. I should be getting my downpipe this week and then the tune as soon as I have the spare cash lying around

**Dirty Bucket** · 10-29-2012 06:14 AM

I have a 2006 WRX stage 2 with an Invidia catless downpipe, I haven't run many problems but, I have encountered very night boost creep but nothing that would harm anything.

**Romdizzle** · 01-10-2013 09:47 AM

Has anyone run into or knows anyone who's had problems with a catless dp throwing codes with the stage 2 map? Just asking because I got my dp yesterday and I'm going to install it tomorrow.