i agree that the Sube wasnt a highreving engine but when it was reved, didnt sound as harsh as other fours.
What makes a engine high revving.
For example I have a 1970 911s 2.2L which you can redline almost all day long while my 300te 4matic sounds beat over 4500 and doesnt want to rev any higher?

Also can someone explain oversquared?

Also any ideas about books i can read