Contact Richard Davies of Wiltshire Superchips he's a top man and can advise you on what's best for wot u want to achieve.
Rich has looked after my cozzie for the past 14+ years was RS mechanic for some 20 years and been chipping cozzie's for yonks.
Contact Richard on 01793-722222 or go online at
www.Wiltshire.Superchips.co.uk
Dave.