I don't think the decat was made correctly as it's a few mm off.
But I'm not giving up lol, I've got an engineer to make me a flange that I'll use as a spacer and I have a angle grider here to insure a tight fit - hopefully
I've put the standard cat back on ATM as need the car to run about in as forgot to put an O ring back in so it's leaskint alittle but I'll just leave it till tomorrow lol
Lol thats ebay for you.
When I took the cat off my polo if just took the exhaust off. cut off the cat with my angle grinder and welded on a bit of pipe. Job Done
sounded the same in low revs but had a nicee roar when it hit 4k+ revs.