i have coilpacks. so early it looks like, ill pull it out and have a look though

More than likely you have the block/heads from 01 but manifold/wiring from your 99, I took a Unichip out of a 98 wiring harness, it's just wired in to the loom next to your computer so as long as you can solder & follow the original wiring & re join it it should be a pretty easy job, you won't need to open the computer but have a look, basically they are charging you for doing a pretty simple job that's a bit time consuming.

good to know thanks mate.