here's a basic XDF for the 2000 new beetle 1.8T that i created. i have one stock file patched with launch control and no lift shift attached too because those variables are in the XDF. this is far from complete but its enough to perform basic tuning on the ECU. if you find this incomplete or missing anything feel free to add a revised XDF with what you corrected or added and post it up here.

Also remember the 2000 beetle 1.8T has smaller injectors, 3 BAR FPR, 2.0 beetle exhaust, the KO3 is supposedly smaller than golf/jetta and so is the intercooler so upgrading to some golf/jetta and or aftermarket parts would be the best bet before you start tuning.