Youve gotta be careful who you shoose to believe on clubs mate, at the end of the day as nice as they are a lot of people are trying to sell stuff to you. Even GMC who are seen as one of the most reputable tuning companies around reckon youll get 10bhp from their green scoop system which is 99% the same as the raceland one, which is a bit of a joke tbh
When I had mine fitted, the fit was terrible, I didnt notice any power increase (although it was only on a 1400 at the time), and I did notice a few flatspots in the powerband