vr6 exeter

hi, i have recently just bought my 2nd vr6, after driving my 1st i dont think ill drive anything else ever again!! my new one is on an m reg and covered 114,00miles, car is totally spotless, i am wanting to get some more power out of the engine, especially looking to improve the accelaration. waswondering if anyone knew the best way to do this and also the cost involved?? cheers, shaun