yes this is right as others have said,
the first 2 are called precats, they help lower the emmisions while car is cold, ie on choke.
when the car has warmed up they are just a restictor, are about 3 to 5 bhp lost each.
as alfa tuner said you can have new from pipes made, alfa holics make a system.
with these removed the car will still pass mot.
me personally went for useing a CF1/2 mani, downpipe, cat and front box,
you do have to have a welder to hand as you have to fit 3 lambda boss's and remove the original on that downpipe, also the cf1/2 front box has to be replaced with a strait pipe to accept lamba monitor.
as alfa tuner says depends how much and which route
TAKE REVENGE!!!, Sh*t On A Pigeon