Two cars, two tunes, same stock turbo, similar boost, similar peak power. Both on 98. Both manual.
One comes on boost like a light switch and frys the tyres in the first 3 gears. The other grips from second on wards, short shift to second and floor it and off you go full grip.
Its not all in the tune, but some is. There are many ways to control boost. And even a few most people arnt aware of.
These dyno graphs are old but good for comparison.
The BA with the blue curve was dead valve springs.
NOTE RPM on the X axis, makes for easy interpretation. Just wish all tuners did the same.