The brakes are not up to the job on T5's as they used the same size discs as the poverty spec models

Most use ferodo ds2500 pads,makes a lot of difference.
A few websites for you.
www.vpcuk.org
www.kalmar/union.com
www.partsforvolvosonline.com
www.swautos.co.uk
Stu @ SW Auto's has the most powerful 850 in the country i do believe, i've seen it a few times as his garage is not far away from me, supposed to be around 500BHP.
Simon.