As above had the opportunity to use a ramp at the workshop my mate works in and fitted the parts which had been in the boot for a couple of weeks. I'm glad to say my suspicions were correct - there was a weird fluttering noise coming from somewhere under boost and I hoped it was just the standard DV unable to cope with the chipped ECU. It sounded kind of like something was stuck in the fan if this makes any sense, but only did it under boost so it had to be something in the turbo pipework. Anyway, combined with the filter I can say it is definitely more responsive, even on light throttle before the boost really comes into play, but when under boost it feels more controlled, I can now hear the turbo spinning up again and when I lift off without changing gear it feels more defined, rather than surging slightly like it used to. Had a bargain on both parts - ebay /ubbthreads/images/graemlins/smile.gif so i'm more than happy.