centre silencer chop doesn't really cause any flat spot, its secondary cat removal that does
As far as I'm aware, removing either cat increases the flat spot.
Pretty sure JCC on here did and he put the cat back in fairly quickly.
yeah we've done loads
we charge £80, so that's about right, just make sure they cut it in a way so it can be welded back on in future!
I had mine removed on the 200, it does give you a flat spot around 2.3k, but I learned to live with it. The time you'll notice it most is if you accelerate quickly away from a junction or roundabout, once you're up to speed you're above that rev range though.
IMO it's worth it for the rasp/crackles/pops it gives you.