the b204 and b234 are regarded by engine tuners as the preferable engine for performance tuning over the later b205 and b235 engines as the internals are of a higher strength. the later models had lightened internal components to improve efficiency and fuel economy but limit the total power output when the engine's software is revised to increase the boost pressures and specific power output. the b204 engine became a very popular engine swap for vauxhall and opel astra, calibra, cavalier and vectras with the gm t-body platform, in scandinavia in the mid 2000s - the engine uses the same mounting positions due to sharing the same platform. in the uk it is swapped into rotary equipped mazda rx8, in ukraine and russia it is a swap option for daewoo (now chevrolet) models of similar age.