Thanks guys.
I could do nothing but laugh as I put the foot down and remembered how good these cars are.
I have got to say that although the ride is firmer, it is also a lot better dampened with the shocks fitted to the RB320, and rides over bumps a hell of a lot better.
The STI's I had before were standard, so having the extra 40bhp really was noticable after a year away from the Subaru.