Hi i curently have a c2 vtr which i am changing soon as i am having alot of trouble with it . i have been looking at the ibiza and loking in the top gear mag at the stats . it states that the 1.8t 20v cupra 3dr has a 0-60 time of 7.3 secs and is only a insurance group 11 . and that the 1.8 cupra t 3dr has exactly the same performance but is a group 15 what is the major difference between these two that makes the cupra t 4 groups higher