I've cut a 1.82 with 310 rwhp/330 ft-lbs of torque. Full weight (3600 pounds), stock 3.27 rear gears, stock stall converter (leaving at 1700 rpm), and stock suspension other than Bullitt lowering springs and Tokico shocks and struts.
60' times are a completely pointless way to compare suspensions unless we are talking equal weight cars making the same power with the same gears on the same tires. I have gone over this argument several times with folks on other forums: I could spend $3000 on a FULL UPR drag suspension setup, and I would gain NOTHING without a converter and rear gear change. It just isn't making the torque on the wheels to cut a faster 60'.
I will speak up for someone I know repping MM. He has a FULL MM suspension, front and rear, H&R
lowering springs, with Bilstein shocks/struts. Full weight (3450), 280 rwhp, 300 rwtq, 4.10s, drag radials, and he has cut very low 1.7s. As I alluded to in the paragraph above, this was power limited, not tire or suspension limited. He could have easily cut 1.6s (or maybe better) if he was making more than 280 rwhp... AND, on top of drag racing, he'll go to and competitively compete in autocrosses and HDPEs. All the while driving it 20k miles a year....comfortably.
I don't think anyone here thinks, or has even alluded to, that MM is better at the drag strip than UPR; you're gonna be hard pressed to prove that. It is of my opinion, based on personal experiences (through good friend's cars), that MM builds suspension parts that are more rounded and suited for a wider variety of events. It might not cut the fastest 60' times at the track (might being the key word), but it will perform very well in pretty much any situation you put it in. 99.9% of people driving Mustangs will absolutely NOT be able to take advantage of a marginal increase in straight line performance of UPR over MM.
My bushings still look fine to this day.....
You don't wanna go there.....
Where the hell is the pissin' smilie.
