Evo i neceg za one koji su se oradovali da serijski X4 nece biti identican konceptu:
http://2.bp.blogspot.com/-_nNrxvui0zA/Ug9nYGaR_CI/AAAAAAAADQY/vHVcmSU9wlY/s1600/def2.jpg
http://4.bp.blogspot.com/-RelmQJBf8Os/Ug9nWJSdhhI/AAAAAAAADQQ/1oIeLwtTR_A/s1600/DEF.jpg