papimack

if I remember correctly the 600hp cat has the same tq output as the 550 cat. last time I checked I think thats what I read

I drive an over the road 1997 internationa eagle at work and it has a 550 cat with an 18 speed. not shure about the rears. I also work part time at a construction company that has a superliner with a 440 E9,and a 18 speed.  I have never had "go" between both at the same time, but i can say they do feel simmilar in power. The mack E9 has the traditional low down tq and the cat is happy in the higher rpms. also the E9 does not have any of the problems most people say they do.

I do know with a mech E9  you cold get lots more from it than an electronic 600 cat.

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Ya know, a few years ago I would have said the same thing, but when you got guys like Pittsburgh Power making computer boxes that can give an electronic motor up to 210 extra hp at the twist of a knob, I'm not too sure. 2500 bucks and 3 hours worth of work and the next thing you know you got a rocket ship. No joke, makes the motor feel like an old school mechanical job. But for my money I'll still take the E9 just on principle.

My name is Steve and I hail from Chicago. I tried fitting in everything else but the competitors trucks didn't suit me. It's Mack for me all the way! I'm also a hard core hot rodder and need info on how to soup the Big Dogs up!