looking at fitting a centre decat pipe to my 2004 wrx but will this put my engine management light on, and if it does will it put it in a safe mode for driving or anything like that?

 

Have a look and see if there is a sensor attached to the pipe or cat that you intend to remove if it has it may well do if not then it should be ok..
Usually centre sections don't have

 

I fitted one last weekend, it does have a sensor but after changing have had no cel issues up till now, maybe I was lucky, but I would say just fit it as it is unlikely to cause a problem.

 

The sensor should be BEFORE the cat, and so in theory there should be no problems. In my experience, the cats that have the sensor IN or AFTER the cat are the ones that will put the light on, the ones before USUALLY dont. Mine was before the cat and i changed it, no problems, no light on and hasnt come on.
I drove it steady for about 50 miles to let things settle in.

If the light goes on, it will put that part of the ECU readings into a base line reading, as it cant get the correct readings from it.
As for harming the engine, if theres a light on its for a reason and could always hinder another part from correctly working. ALWAYS get it checked, and especially on turbos.

Maybe some others will come and say different, DONT take just one persons answer. Let everyone have their say and see what comes out.

 

what year of impreza do you have?

 

Fitted a full system to my 98 and a center de-cat and tailpipe to my friends MY03

Should be the same as yours on that one

 

thanks mate for the input just orderded one, so i will keep my fingers crossed

 

ive fitted a deresonated centre section and a 2nd cat,decat pipe on my bugeye and ive had no cel light mate