A mate sorted the exhaust himself (de-cat & downpipe), air filter and then had an Ecutek remap @ WRC Technologies and got 323BHP (Dyno Dynamics RR). He regularly 'kicks the arse out of it' to use his own phrase

, and even gets improved economy when on a run & being sensible. They said he could have gained a little more if changing the full exhaust, but he didn't want it to be too noisy so he's happy for now.
His also has the larger rear spoiler upgrade as a gesture of good will from his dealer, as he had to reject his previous car, and they couldn't find him a replacement the same colour.
I think it's a great car, and could easily have been tempted to the dark side if I hadn't uprated my EsCos