[Steve C.]

The ground clearance issue is really a positive deal.
Example, with the current 2" Headman race headers installed on my car the bottom of the collectors are about 3-3/4" below the subframe. That approx 3" difference is a big deal and I'm using the car more often on the street with the current pump gas motor.
My current 2" headers are left over from the previous 700hp/7000+ rpm combination and I've been considering a change.... for ground clearance issues plus the computer program suggests a 1-7/8" size is the hot ticket.
So my interest in the 1-7/8" size.
I have read that the Tri-Y design lends itself to street applications because, by design, it pairs cylinders by fireing order for improved flow. This reportably is good for low and midrange. (not that everyone needs more low end grunt! You can only apply so much power on the street)
I look forward to seeing the dyno testing comparing the entire power band against a set of 4-tube headers.