c'mon Steve, don't be a lazy a---e! It 's car up the stands, 8 bolts each way, disconnect and reconnect the sensors, car down and only once a year
I will do it for extra ponies anytime and save more good change for other mods. The evo/ scooby/RB crowd are at it so why not
High flow cats will likely net you just as much as decats but save the hassle. If you have an FI Zed, sure decat it, but unless you are FI there isnt much point for the hassle.
On other cars there is a big gain, IMO as someone said if you have them fitted and mapped for a decat im pretty sure you will gain. I gained a fair bit in my clio and my mpg went up too!