This is a discussion on Attn '02-'05 WRX Owners: The Importance of the Uppipe Mod within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by SKI.WRX FWIW I recently passed Colorado emissions testing with no pre-turbo catalytic converter and stock turbo back. ...
The EGT sensor is only there to monitor the catalytic converter temp, it's not useful for EGT readings like when you install a gauge (which you typically tap in the exhaust manifold in the #4 runner. Since there is no cat, you don't leave the EGT sensor to possibly get sucked into the turbine. You want an uppipe without a bung, ideally, but if you get an uppipe with one, you plug it with a bolt and toss the EGT sensor in the trash, and plug the connection with a resistor.Originally Posted by nateleeg
Makes sense, thanks. Now I'm debating between a solid pipe, or the flex pipe. I can't help but the think the flex is a bad idea
A really good UP doesn't need a flex if it fits perfectly.
I've had zero issues with my crucial for many years of use, and have never heard of any from any other user.
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Replacing the uppipe with one that has no cat...will that cause emission issues at inspection? If I have to replace my engine I'm gonna rip out the factory uppipe before i drop in my replacement for the sake of ease.... unless emisisons will arise
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so as long as i get one with a cat i'll be good? if thats the case, will i still run the chance of sucking parts of it into my turbo?