Well - since you ask - I don't think 100hp from the 8v 1.3 is that easy to achieve - it's rated at around 65 hp stock, there is a twin cam 16V version that does deliver 100hp, so it is possible, but on the 8V, that extra power will mean extensive top end modifications, and you can expect the power at the top of the rpm band, is that what you really need off road?