Hi guys I have just got myself a standard cat downpipe to swap over from the decat on my 2001 WRX cos I'm sick of the check engine keep coming on ref the emissions from the decat, but my question is : is it an easy job to do if I was to do it myself or would it be best for a garage to do it? It looks like it's just bolt off bolt on, is it that straight forward ?
Any help would be appreciated

 

The car should have been remapped if running a decat.A decent mapper will sort out the CEL.

 

hi mate i have changed a cupple of em, 1 being today, i fitted the decat center section(straight thro) and also a sports cat down pipe.
it is really easy to change the down pipe mate, arm yourself with a can of plus gas (as bolts are none to snap/ringoff) and away you go. remove turbo heat sheild(its abit of a pain as the bolts are in the orqadist places),unplug lambda,then just a case of undoing the bolts under neith (get the car on front axel stands) and then bk uptop to the ones that hold it to the turbo. make sure you get new gaskets especially for the one that sits between turbo and down pipe(£19 i payed and thats the cheepest i could find a o.e 1 inc delivery) i got it from here and it came nxt day www.cotcomp.com hope this helps you

 

If you want genuine subaru gaskets cheaper than the main dealer you can also try these:

http://cgi.ebay.co.uk/Subaru-Impreza...item518fc5d91f

 

Rather than swapping the exhaust downpipe back to standard, i can disable the faultcode in the ecu, and adjust the boost, fuelling, and ignition timing, if you like

Drop me a PM if you're interested.