Andrew, as you will know from your Audi Quattro S1 E2 replica experience, there are replicas, and there are replicas, there are Gp. 4 Stratos replicas like Vince Abbotts car that are really, really close doppelgängers, and there are those that are visually representative of Gp. 4, and those changes extend to chassis set up and engine spec, there are cars on this forum with a lot more power and torque than even the 'in period' works 4 valve cars ever produced. So the thing I would suggest that you avoid is setting off on this adventure (at will be an adventure) with no clear and detailed vision of where you are going, and what the final outcome looks like, hope this helps, welcome to the club, and good luck, Griff