[Rev]

My experience is that Tri-Y's work great for the street where max RPM's are under 6000 and you need some low end torque. I'm sure shorties are also fine for the street in 5000-6000 RPM applications.

If you have an engine that delivers peak power at higher RPM's, and is more of a wild street engine or one set up more for the track, you'll want larger primary tubes and 4 into 1 type headers like Hooker Super Comps. That might hurt low end torque in a street engine though.

Try to match the headers to the application of the engine. Hope this makes some sense.

Rev