what u guys think about this dyno graph? the car is a clio 200 and they only did an exhaust system (not my car). done by viper performance exhausts. power is on the fly wheel.
i would say that it was a over reading rollers myself. due to the fact that clio 172/182/197/200s never come out the factory with bhp as they should be and you wouldnt get 10bhp+ from just an exhaust.
I would guess rollers had been tweaked between the tests. If companies like Akrapovic, milltek etc who are much better known performance brands can't get that power I doubt a smaller company like viper could.