Posted 19 November 2012 - 11:22 AM
Yep, piece of the destroyed cat has lodged itself either in the outlet of the cat or the first res. Most likely the cat. Undo the four bolts, replace cat (to be legal) or bash out the obstruction and put it back in. My R31 did the same thing - peice of cat would rattle around inside the casing, and when I gave it more than about 2500 rpm, it would be blown into the outlet and reduce the flow from 2 1/2" to about 1/2".
Be careful if you bash it out and put it back - no cat will mean a vastly different exhaust note that many cops know the sound of, and lots more stink from it too. Can always tell which cars dont have cats just by the smell when driving behind them.
MY00 Red RX, a nice daily that was sold off once the B4 became reliable...
MY02 Blue B4, aka 'The Project' - v8 JDM STi engine package and assorted other 'goodies' - Sold, then bought back for parts. Stripped and crushed.
MY03 Blue RX, the newer old daily, pretty well more B4 than RX now... In the process of being converted to the track toy... Watch this space!
MY02 Silver Wagon, H6 conversion, full blue/black leather and almost full black interior to go with it. In process of being stripped and sold off.
MY03 White/Silver H6 Outback, donor car for silver waghoon. Scrapped.
MY97 Silver RX, acquired to become track car, but plans changed. Scrapped.
MY13 BRG, current daily, very nice to drive, small mods to make it even nicer again.