tha shock towers are not worth it there would be if they would be thicker........ but there pretty thin they break easyly in a bad flip over since there so britil the CF upper deck is a good idea tho to take some fatty of the car changeing the engine is not hard at all it will take u about 15 minuet to swap the engine..........my slipper is set so u can see about 1.5MM of tread sticking out behind the bolt and ive always left it there and ive never had an issue with breaking anything in the tranny hopefully others can u get there input.........about the spring........YES put the blue ones in the back u wont really need the front ones but yes in the back you lov the diffrence.......