I don't know if this counts but, I had the SHO Shop 8 pound unit on my sho,I know It's not a tour  Anyways, I never had a problem with durability. It did have a steel insert and starter ring. The engine did have a bit of a rough idle though. The clutch I used was the Hi Revs race duel diaphragm kevlar clutch, AKA lots of clutch chatter,hard launches and tire spin. I know that when I do the clutch on the svt I will go to a aluminum unit and a clutch with more manners for sure Good luck on your decision.
Mark
00 svt tour- K/N filter, SHO SHOP Y pipe, 2 1/2" back to rear Y, improved tunes.
91 sho- Hi flow Y pipe, 2 1/2" exhaust, edlebrock rpm series 2 1/2" muffs, modified intake, K/N filter, modified manifold, 190 lph fuel pump, magnacor wires, ford double platinum plugs, underdrive pullies, custom LPM, 8 pound aluminum flywheel, hi revs race duel diaphragm kevlar clutch, solid torque limiters, poly bushings evrywhere, heavy duty subframe bushings, heavy duty engine and trans mounts, subframe connectors, front and rear strut tower braces, eibach springs, tokico struts, camber ajustment plates, light weight swaybar end links, cross drilled rotors, carbon fiber pads, 225/55/16 SP 5000's, redline water weter, redline trans fluid, mobil 1 synthetic oil, police grill and the need for speed!!!
It's a chronic disease.
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