clio group N is very popular car these days. it's possible to build it for 10-15k€ with realyy good Sadev dogbox gearbox and driveshafts. engine should stay standard but gearbox and driveshafts must be Sadev for top results. suspension is the problem because you can put 4k€ in it but if you are not the top guy, what for... swift is a nice car with around 140bhp and it usually finishes rally and that's very important.