cool, looking at PTP site confirms exactly what you're saying, and explicitly rates 35mm upto 190bhp, so thats more than I ever expect to get.
The EP piper manifold is lovely, have to see whether I can afford to get that though. Pay off in the long run, but pennies are a little tight.
Off to check what manifold i have...
EDIT: Checked tonight and it's the 6 bolt so thats positive move to the 'just get a replacement pipe' camp.