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Ran my D36 for two years on slicks down to low 1.6s.
Ran my D44 for two years at very low 1.5s and now 1.4s.
Recently went to a spool for the D44, which is working GREAT. Barely noticable for street driving, and works unreal for the strip. Not 100% necessary, but nice piece of mind knowings its in there.