CS European Cats on a 03 US 360 ?

Richard, on Eurospares, the cats parts seem to be different between EUR and US market:

RH Cat

EUR 199064
US 181966

LH Cat
EUR 199065
US 181967

(Identical cats between 360, spider and CS)

I have no clue what is the real difference and if a EUR Cat would light the CEL on a US CS. This would more depend how the US Motronic has been mapped compared to EUR. The question remains, do have US Cats the exact same number of cells as EUR cats?

 

I know that when I weighed my stock Euro cats I got different figures (lighter) than the figures posted on here for other members weighing their US cats. The US cars always produce quite a bit less power and more weight than Euro cars too so I'm guessing the weight and restrictive nature of US cats definately impacted performance. I'm sure if you change from US to Euro cats it will definately be classed as a modification by insurers so you may as well buy even less restictive ones by opting for aftermarket cats.

Both Hyperflows and Kinetix cats are drastically lighter and more free flowing again but of course you get nothing for 'nothing' and volume (decibels) will most certainly be up as a result of free flowing cats as will power.