Due to gas prices around here (Portugal) most of people buy Diesel.
It's quite common to see Ibiza's FR, with bigger turbos,bigger IC, Race520 injectors and mapping doing around 250hp. With cams, "worked" turbos and exhaust manifold, wider exhaust lines they go very close to 300hp.
In BMW's, i know about an 335d, with only remap, doing 349cv, 700nm.
Even the old PD 110hp, with a turbo, IC, race 502 injectors and 60mm exhaust run around 200hp
Video of a (very) loaded Ibiza FR 130hp vs. and stock Audi TT-S
[youtube]IykM4Dc8cxU[/youtube]