I have an EL XR6 which has been blown for 5.5 yrs. I drive it HARD
and hit the rev limiter regualy as the 5,500 RPM approaches very quickly with 9PSI. I have never had a drive train issue (other than one caused by a faulty timing chain tensioner
) and still consider the car as very sound after 150,000 Kms.
I do change the oil every 5,000kms and filter every 2nd change. I change diff oil and gearbox every 50,000.