David,I drive my car maybe once a week so "the price point" was important to me. when I sold my wheels with the nitto 555's the guy buying them was saying the tires look brand new.
I've had 4 different sets of tires on the car in the 2 or so years since I've owned it and for the money spend these tires they are by far the best value for the sizes offered. if I had a lot of money to throw at tires and the car got drove more I would have went with a different brand.
also I don't know how these MT would act on a warm day, my 555's were on the car during the summer and its been cold when I got on it with these MT's. might make a difference...might not.
If you don't have a real high HP Mustang the MT tires will be just fine.
But ........
I would say if a person was running 4:10 gears and Plus 400-450 RWHP the MT tires even in the summer are not going to hold.
I've ran a lot of different wheels and tires and honestly what I have found with Street-Tires with say a wear factor of 300 or greater.
They will not [Hold] on the street from a stop and a person just really jumps on the gas.
It's just the way it is as those tires were never meant to hold on the street with low gears and high HP.
They are designed for quietness, wear, looks, rain etc. with normal power.
As my HP & Trq. increased I can tell you this as a fact.
Not one tire that has been under my Mustang would hold on the street from a stop under full throttle.
Since I know that to be the case and don't wish to run Street Legal (Drag-Radials) that have No-Wear & throwing Crap all up on the rear fenders as well as underneath.
I'll stick with a good looking tire that performs OK but not Super Sticky for drag-racing on the drag-strip or street.
I hope you find the MT Street Comp tires to your liking as I have ran them for years now.
I'm waiting to see your's with the Bright Yellow Lettering.
Terry