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Old 09-14-2005, 07:30 PM   #1
DeKaP
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Default Cobb ap stage 2 question....

if i have a up pipe and downpipe but stock cat and muffler, could i still run stage 2 or would i need to replace the catback as well?
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Old 09-14-2005, 07:44 PM   #2
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as long as u have aftermarkert dp thats all u need for stage 2
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Old 09-14-2005, 07:44 PM   #3
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Quote:
Originally Posted by DeKaP
if i have a up pipe and downpipe but stock cat and muffler, could i still run stage 2 or would i need to replace the catback as well?
From Cobb's site:
Quote:
Originally Posted by Cobb
Q. What is needed for Stage 2?

A. We actually field a lot of calls with people wanting the Stage 2 AccessECU because the dyno graph looks a lot better, but they do not have a turbo-back exhaust. Here is a diagram of the exhaust to help you visualize:

The Stage 2 was tuned on a car with a full turbo-back system. If you have pieced together a less than optimal combo of parts or those that were not designed to work together you may not get the full benefits of the Stage 2 AccessECU. Boost may not come on as quickly and the peak power may be down from those that have a well designed full turbo-back system. If you have replaced the first section (second cat or downpipe section) and nothing else, then the Stage 2 map is what we would recommend. Again the results will be far less than optimal, but it will control the boost better than the Stage 1. If you have replaced sections 2-4 (third cat, mid-pipe, and muffler section then you are still Stage 1. You managed to get all except the part that makes the most difference. Again, we want to reiterate that Stage 2 will only get the intended results with a well designed complete turbo-back.


It only takes a little research to yeild the answers you seek.
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Old 09-15-2005, 02:09 PM   #4
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Yes, you can run stage 2 on a stock catback as long as you have a non blank-plate downpipe (something other than stock or HKS). If you still have the stock 3rd cat and the stock catback exhaust you will not see nearly as much power gain. This is true for anyone running a catted TBE when compared to a non-catted TBE. The more restriction you have after the turbo, the more power you are robbing from the system.
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Old 09-15-2005, 04:54 PM   #5
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Ok, seriously, you need to get your facts straight. This is the second thread you've posted that crap about a stock style plated downpipe in, and you're wrong.

Please check your facts. I JUST posted directly from Cobb's site so the guy could get a handle on what he REALLY needed and then you come in here with that crap. Where does it say anything about having a non stock plate style DP?

I can tell you from *experience* that the HKS DP works just fine, and if you would like a dyno plot, I can provide that two....

Please. Seriously.
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Old 09-15-2005, 06:15 PM   #6
S203
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Actually, you don't even need an after-market pipe, you only need a catless one, gutting your stock pipe will allow you to go Stage 2 with no issues.
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Old 09-15-2005, 06:18 PM   #7
shinsain
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That is also true. Although I've heard its a huge PITA to clear both cats from your downpipe and midpipe. For my cash, I'd just buy a dp. But I'm lazy too.
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Old 09-15-2005, 06:20 PM   #8
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I wish I could find a catless down-pipe that would take the place of both factory pipes and not use a doughnut gasket, do you know of one Shin?
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Old 09-15-2005, 06:27 PM   #9
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Yeah, sure, quite a few....HKS I know for sure.

Are you talking about trying to bolt one up to your stock cat-back? If so, then, unfortunately, you'll most likely be using a donut gasket.

The HKS can use the stock donut gasket, or a layered metal type as well. It will bolt to almost all aftermarket exhausts and the stock one as well.

Let me go check something.....
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Old 09-15-2005, 06:30 PM   #10
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Yeah, if the stock cat-back is in use, its donut all the way. I just went to check. I haven't ran the stocker for so long, I forgot.

But you can also go to a muffler shop and have them weld up a 2.25 inch piece of pipe with a flat flange like most aftermarket downpipes use, thereby allowing you to use a flat gasket.

Shouldn't cost too much either.

Aaron
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