MRC remapped mine slightly (changed something to deal with the extra torque) but said that it wasn't worth spending much time on IF all you want is quicker shifts... Something about it being a slow shifter. I think it's a bit of a lazy box but if anyone will know I guess it will be someone like MRC. Give them a bell. Won't cost anything to ask.
Mine is quite laggy in Sport mode as after the remap it just pulls like bu99ery all the way to the red line and when the TCU decides it needs to change gear, it's like someone has turned the engine off... Then the TCU makes its mind up to upchange a second later (which feels like 5 seconds when you're gunning it) and whoooaaaa..... off it gallops again toward the red line. I don't think you will ever get super speedy shifts from these older 6 speed boxes TBH.