Hi guys,
Not sure if this is the right place to be posting this so if it's not I am sorry.
I installed my Plenum spacer recently and so far it's been giving me a bit of hassle, last night I started the car up and have it a few revs (to see if a previous error would come up again) and sparks started coming out of one exhaust pipe only. I have two japspeed pipes which obviously have a cat each. Do you think one of the cats has gone or would it be something more serious?
Thank you.