That's the theory. Let me say something in reality... 10 years ago when I changed from my 10 year old Maxima V6 to 3 year old STI, OMG!!! I found the STI engine vibrated like crazy!!! So I decided to love Nissan continuously and buy G35S... Again my 13 year old G is still very smooth now and my son is still driving it... But, I admit building reliable H4 engines needs much higher engineering level...