Hi, I just removed precat from up pipe on friends Subaru Bugeye 2.0 2k, now it have terrible bangin sound on low rpm. I kept original pipe just pulled precat out as it was blockin turbo periodically.

Any solutions ?

Is there anyone using decat up pipe from ebay?

Can you get a clip of the sound ?

No idea as to the cause but if you post up sound maybe someone will be able to pinpoint it

Could be just the unburnt fuel igniting in the exhaust. Mine pops when I change down gears or just rev it a bit.

Will post sound tomorrow with video, I mean so it just because nothing blocks gases now, so it is expanding in tube and doing bang, If anyone have stainless flexible decat pipe fitted and have good sound it will be good to know, ecu is still untoched, so it might be fuel as well. But on higher rpm sounds good. Up pipe is still sane, I just pulled cat out

de catin' shouldn't give a 'funny' noise, was it there before and it wasn't noticed?

all cats was removed, it was huge downpipe and rest of exhaust fitted, that noise started after pulling pre cat out of pipe, but pipe itself was not swapped.

 

I'm not soure if decat up pipe is worth of trying, but if nothing else, there's that metal hose at the middle, later today I will post video

http://www.japspeed.co.uk/subaru-impreza-decat-turbo-up-pipe.html

 

Is this worth of trying?

Is it a cheap pipe ? Might be blowing