Well I can defo confirm there are 3 cats in Newage bugeye, and if you remove the Downpipe then it brings on Cat effiency CEL and up pipe Cat can sometimes throw up a fault with Cat temp. If your running a decatted downpipe and centre I would recomend also decatting the up pipe, not only for power/noise but some people noted the up pipe going nuclear and killing the turbo.how true this is I dont know but aint worth the worry.
It can take upto 350/360 miles before the CEL comes on with a decat ( trust me i counted ) or if your unlucky it can take 10 ( also counted) Point to notice is that sometimes the CEL fix doesnt work. Had one fitted to mine and CEL glowed merrily, and annoyingly for ages.
If your wanna sell your sports cat downpipe for 150 quid let me know Simon......aint I the most cheeky git ever
Spooks