(a) See permitted modifications listed under M6.4.1 and restriction stated in M6.4.2 In relation to listed cars, any further modifications will cause the vehicle to be reclassified into class 8.
(b) M6.7.1 – The use of wheels of diameter(s) other than as specified above will cause the vehicle to be reclassified into class 8.
(c) M6.8.1 & M6.8.3 The use of gearbox and rear axle casings other than as specified above will cause the vehicle to be reclassified into class 8.