Ok, heres an update for you all.
Apparently all MY2008 cars have the different downpipe, not just facelift cars (which is something I hadnt appreciated).
Revo have a fix for the issue that is caused by the different downpipe design, I'll be dropping my car in to have the new map applied at some point in the next couple of weeks , when I get a chance.
I'll let you know if it fixes the issue, but revo are confident it will.
I'm getting mine reflashed this weekend so I'll try and report back.