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Cobb Stage 2 question
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| 08-26-2011, 03:33 AM | #1 |
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Cobb Stage 2 question
In preparation for Cobb Stage 2
 , I 've noticed a requirement or recommendation is a catted-turboback exhaust. My question is, will a Full Exhaust System (Starts at OE Downpipe, Ends at Tips) be sufficient with stock dp or should I spend another grand on catted dp  ? Thanks in advance.My recent thoughts... catted dp vs stock.  Last edited by EJ_3; 08-26-2011 at 04:22 AM.. |
| 08-26-2011, 03:39 AM | #2 |
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for stage 2 you should focus on the dps . Catless would be best .
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| 08-26-2011, 09:31 AM | #3 |
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The biggest restriction and biggest gain is removing the stock downpipes and replacing with catless downpipes. Off the record the need for a catback exhaust is more suggested then mandatory.
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| 08-26-2011, 09:43 AM | #4 | |
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catless dps
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| 08-26-2011, 09:53 AM | #5 |
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With the higher boost, arent the turbos at high risk of burning out if they are restricted by a stock exhuast? Therefore, at least bigger catless DPs should be considered with the mids removed as well for added safety?
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| 08-27-2011, 01:09 AM | #6 | |
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 Same thing I was thinking...
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| 08-27-2011, 01:16 AM | #7 |
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What about emissions? If I replace my stock downpipes with catless downpipes then how will my car pass emissions testing in my state?
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| 08-27-2011, 01:21 AM | #8 | |
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| 08-27-2011, 01:29 AM | #9 | |
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| 08-27-2011, 03:41 AM | #10 | |
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| 08-27-2011, 10:19 AM | #14 |
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they indicated they would have racing and meth maps. Timing wasnt clear.
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| 08-27-2011, 10:52 AM | #16 | |
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With cobbs dp fix in stage 2, you shouldn't have a problem passing emissions via an obd port test, you may only run into a problem if they give you the sniffer, which I have never seen done. Catted dp will improve flow over stock, but IMO they are a waste of money, catless are cheaper and flow much more freely.
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| 08-27-2011, 11:22 AM | #17 | |
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If it's the latter, then we won't need a standalone DP fix 
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| 08-27-2011, 12:09 PM | #18 | |
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| 08-27-2011, 12:29 PM | #19 |
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From what I've read the stock cats in the midpipe do not get hot enough for the chemical reaction that "cleans" up the exhaust to occur, so I'm thinking that catless dps and stock mids will not be a problem. I mean stage 1 is designed for a 100% stock car and stage 2 really shouldn't be THAT much more aggresive. But no-one know until Cobb actually gives us some info
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| 08-27-2011, 12:33 PM | #20 | |
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Will you pass a visual (if they know what to look for) or a sniffer test? No.
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| 08-27-2011, 01:19 PM | #21 |
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 Maybe I should reword my question... will a full exhaust system that starts at OE Downpipe, ends at tips (i.e. HKS, AE, etc) be sufficient with stock dp or should I spend another grand on catted since it's recommended to have a catted turbo back exhaust? Nothing about meth, catless, or emissions.
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| 08-27-2011, 04:48 PM | #22 |
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Just found my own answer... For those who wondering about stage 2 mods
- Dual cone intake - Upgraded front mounted intercooler - Downpipes (high flow catted downpipes are acceptable) - Cat back exhaust system (with secondary cats removed or replaced with high flow cats)
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