Well, I've been running this 4 banger for about five years now and I'm still learning things about it.  I went "muddin'" yesterday, and that thing can sing a hot tune when my foot is in the throttle body!   

  Since I was otherwise occupied at the time, I didn't  check the tach whilst enjoying the music.  This brings me to the question: does the 2.5 have a rev limiter in the TBI version?  Or do you just wind it 'til it can't suck any more air?  Just wonderin".