Join Date: Apr 2007
Location: South America
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I have a quick question about doing an Uppipe install on my WRX (yes I searched endlessly)....
I will be doing a retune after the install, but I'd like to know beforehand whether removing the cat in my uppipe/buying an aftermarket one (say HKS) will throw a CEL? In the forums, someone claimed that the uppipe mod will throw a CEL due to the EGT recording higher temps????
Does the cat cool the exhaust? Sounds fishy........
Or, will an O2 sensor CEL come up instead? (Got a stock downpipe so never had to do any CEL fixes before). If so, I gotta clear it by reflashing the ECU?
Got a stock exhaust on my car btw (don't like that much noise).
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