outa your previous posts the leon is probably the best bet.
i had the 1.8 at 180bhp standard, according to diagnostics it was sitting just over 210bhp and 260ftlb 6 was around 6.3 when i was logging - few mods done but nothing major
a good couple of grand on the engine- turbo, intercooler, exhaust and injectors, then around another grand on the gearbox for the flywheel and clutch - OEM or uprated both cost around £1k over here in parts. a change to a single mass flywheel from the dual would be advisable
lose alot of the weight from the car, rear seats spare wheel etc
and youll need a good mapper and i dont think youll be that far off 5.