I know, but the S3 IC would be the ideal IC for a K03 stage 2+... You'll get lag that I bet you won't like much...
Got to agree with this, assuming it's in addition to your OEM cooler, @r5gtt ?
An OEM replacement like a Peron or Airtec Stage 2 you could probably run without any detrimental pressure drop. But on a k03, two coolers, and all that volume to fill, it's got to be pushing it a bit. There's only so much air a k03 can move.
Actually that's got me thinking laterally about a way round this. Could you get rid of the OEM cooler and reroute the pipework so that you're just running this front mount? Assuming this on its own would do a comparable job to an S3 cooler on its own, albeit in different locations.
Moving it in front of the rad in itself should see benefit in terms of heat exchange. But there must be some logic in VW designing the layout as they have.