About to pull the trigger on exhaust/cobb AP. Flex or non-flex UP? - Subaru WRX Forum
 
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post #1 of 7 Old 10-14-2005, 12:27 AM Thread Starter
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About to pull the trigger on exhaust/cobb AP. Flex or non-flex UP?

Hey guys, i'm just about ready to install my Perrin divorced downpipe, borla hush, cobb accessport and downpipe. I've been doing a lot of research on the benefits/disadvantages of having a flex UP. Obviously the flex pipes are easier to install and usually cost less. The disadvantage to a flex UP is that it has a tendency to leak more because it is made of relatively thin stainless steel which will contracts/expands more than cast iron and can cause this phenomenon. This being said, i'm leaning towards a cast iron UP such as the one made by turboXS. My only concern is the difficulty of installing the UP. I'm going to have a mechanic install the entire system who has a ton of experience with turbo cars (mainly Audis, Porsches and VW's). If he is comfortable with installing a cast iron UP should I go for it? Any other UP's you would suggest? I really want to install this once and forget about it. I don't want to monkey around with an inferior product and have to track down an exhaust leak at a later point.

Secondly, since I'm going to use the cobb AP immediately to flash to stage 2, should I even bother with a mechanical cel fix?
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post #2 of 7 Old 10-14-2005, 08:46 PM
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I have the Perrim UP with no problems, some have used solid UP's and had them leak went to the Helix and never leaked again. As long as you buy a quility UP and install it right you should be fine.
The install is fairly easy if you know how to work on cars just a PITA to do, you have to disconnect the motor mount and jack up the engine a bit to remove and install the UP. If it was me I would still install the CEL fix

My turbo's fixed and a lot better =)
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post #3 of 7 Old 10-14-2005, 08:51 PM Thread Starter
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After talking it over with my mechanic I decided to go with the helix flex UP. So why would it be a good idea to go with the cel fix? To prevent the EGT probe from burning out?
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post #4 of 7 Old 10-14-2005, 10:32 PM
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Well, my perrin uppipe removed my EGT sensor.. it's still sitting in my stock uppipe in my garage.

Jon
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post #5 of 7 Old 10-15-2005, 09:58 AM
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you do not need any CEL fixes for the UP EGT or the rear 02 sensor, the
AP takes care of them automaticaly.

I would remove the EGT sensor from the harness and remove it from the car (do not install it in the new UP).
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post #6 of 7 Old 10-15-2005, 10:31 AM
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The helix uppipe has an EGT bung....
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post #7 of 7 Old 10-16-2005, 11:56 AM
 
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If I could do it over, I would get the TurboXS uppipe. Their new one (isn't cast iron) retains the stock inside diameter has a flex section. But the most important part of an uppipe is that you install it properly. Follow Perrin's instructions for installation, they are the best IMO.
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