Look at the Dyno Print out a massive increase in power and torque !! and a cheap system NOT !!
http://www.ebay.co.uk/itm/rs-gear-W...156466?hash=item3d467632f2:g:nSsAAOSwjL5ZN8Vq
http://www.ebay.co.uk/itm/rs-gear-W...156466?hash=item3d467632f2:g:nSsAAOSwjL5ZN8Vq