Cobb STG 2 + downpipe only...results?

MF-DIF · 01-08-2005, 07:39 PM

What type of performance gains will I see with running AP Stg. 2 w/ DP only? I can't image it being the same as Stg. 2 w/ full TBE (approx 225whp). What kind of numbers would I typically be seeing...210whp would be my best guestimate.

Also, can I expect the same safty as the Stg 2 w/ TBE running just a DP or is the map too aggressive, causing some potential problem down the road?

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Chigliakus · 01-08-2005, 07:57 PM

There's plenty of info on this if you search, I know I've commented on running Cobb stage2 with Cobb dp and stock cat-back in a number of threads...

The general consensus seems to be about 10 hp lost if you use the stock cat-back with a full dp (no cats, or a high-flow cat). Maybe a greater loss with a stock 3rd cat. I doubt it's going to cause problems for you, you'll just be a little slower and lack the wonderful deep boxer rumble that a full tbe will give you.

MF-DIF · 01-08-2005, 10:57 PM

^I did a search for this but it turned a lot of threads that didn't really pertain to the question I had. I think the terms downpipe & cobb are used way to much to narrow down an effective search.

Thanks for answering my questions though. Just trying to make an educated decision on meh mods.

BigJ04STi · 01-08-2005, 11:56 PM

Why just a DP?

The reason I ask, is cause ypu can easily make a more optimal Turbo back with little sound if you'd like...

Check out daddysscp.com

Look at the 3" divorced DP w/ cat, and 3rd cat eliminator...this gives you 3" piping back to the cat, then ti tapers to 2.5" for a stock style cat back...

Also they have an option for a 3" mid section, that again will taper to 2.5" to connect to a 2.5" axle back. This would give you better exhaust flow, without a loud set up, and allow for bigger hp gains.

Of course if sound is not an issue, and it's money or some other issue...This won't help...

Just an idea though...

MF-DIF · 01-09-2005, 12:10 PM

^You hit it on the head with the money thing. I can always go full tbe later, but for now....$600 AP + $210 ERZ DP+UP...pretty good start & bang for the buck.

01-08-2005, 07:39 PM	#1
MF-DIF Scooby Specialist Member#: 62197 Join Date: May 2004 Chapter/Region: MWSOC Location: 'Murica	Cobb STG 2 + downpipe only...results? What type of performance gains will I see with running AP Stg. 2 w/ DP only? I can't image it being the same as Stg. 2 w/ full TBE (approx 225whp). What kind of numbers would I typically be seeing...210whp would be my best guestimate. Also, can I expect the same safty as the Stg 2 w/ TBE running just a DP or is the map too aggressive, causing some potential problem down the road? * Registered users of the site do not see these ads.

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01-08-2005, 07:57 PM	#2
Chigliakus Scooby Newbie Member#: 77525 Join Date: Dec 2004 Location: DFW, TX Vehicle: '02 GDA, PSM '93 FD, Red	There's plenty of info on this if you search, I know I've commented on running Cobb stage2 with Cobb dp and stock cat-back in a number of threads... The general consensus seems to be about 10 hp lost if you use the stock cat-back with a full dp (no cats, or a high-flow cat). Maybe a greater loss with a stock 3rd cat. I doubt it's going to cause problems for you, you'll just be a little slower and lack the wonderful deep boxer rumble that a full tbe will give you.

01-08-2005, 10:57 PM	#3
MF-DIF Scooby Specialist Member#: 62197 Join Date: May 2004 Chapter/Region: MWSOC Location: 'Murica	^I did a search for this but it turned a lot of threads that didn't really pertain to the question I had. I think the terms downpipe & cobb are used way to much to narrow down an effective search. Thanks for answering my questions though. Just trying to make an educated decision on meh mods.

01-08-2005, 11:56 PM	#4
BigJ04STi Scooby Specialist Member#: 77239 Join Date: Dec 2004 Chapter/Region: Tri-State Location: A Town Vehicle: 2004 Impreza WRX None	Why just a DP? The reason I ask, is cause ypu can easily make a more optimal Turbo back with little sound if you'd like... Check out daddysscp.com Look at the 3" divorced DP w/ cat, and 3rd cat eliminator...this gives you 3" piping back to the cat, then ti tapers to 2.5" for a stock style cat back... Also they have an option for a 3" mid section, that again will taper to 2.5" to connect to a 2.5" axle back. This would give you better exhaust flow, without a loud set up, and allow for bigger hp gains. Of course if sound is not an issue, and it's money or some other issue...This won't help... Just an idea though...

01-09-2005, 12:10 PM	#5
MF-DIF Scooby Specialist Member#: 62197 Join Date: May 2004 Chapter/Region: MWSOC Location: 'Murica	^You hit it on the head with the money thing. I can always go full tbe later, but for now....$600 AP + $210 ERZ DP+UP...pretty good start & bang for the buck.