Welly (what's your name anyway?), on my turborevs kit I'm definately using a reducer from 63mm-60 on the cold side, although the kits supplied these days have a 60-60 coupler which ahs to be stretched stupidly to get it over the 63mm outlets on the core.
I'd put really good money on the fact that the cold side pipes are 60mm. I also used a 60mm forge map pipe on the AUM I did for audi1.8Tdan, and it was a tight fit in the TB hose.
With regards to hiding the pipes Tim, if you were to get the turborevs kit, to hide the pipes you'd need 6x63mm 45 degree bends, 1x 63-50mm 90 degree reducer, and 1x 63-60 90 degree reducer. fit the 45 degre bends onto the core of the cooler, and at the point where the standard pipework from the kit is facing 45 degrees outward towards the road cut it off and fit the 90 degree reducer, which should then point perfectly to the 45 off the cooler. these will need to be joined with a short length of 63mm pipe.
On the cold side, cut the turborevs pipe where it's facing vertically downards, and twist the 90 degree reducer to face the 45 off the core, and again, join with a short length of 63mm pipework.
I may try and do this to mine over easter, as I've got a standard bumper I can refit to get my grilles
If that doesn't make sense tell me and I'll try and draw it somehow!
