well if you get on to Revo's webiste, ring the number, and they will put you towards a local Revo operative in your area. I had mine done in Lincoln. a top bunch of guys if you do go there and very helpful. i didn't trail it before, no. but to be honest, the way the car is now all i would have said is yes anyway. more power, more torque, more fuel economy, and all a lovely christmas present off my wonderful lass!
best of luck if you go for it mate, you won't regret it, and Revo is a well known and respected company. Can't do much better in my opinion! but hey, i'm quite new to all this modding, etc!