My guess is that the OE brake lines are better quality than most of the SS lines we install as an "upgrade". Just remember that rubber has a finite life and should probably be replaced after 10 years. Having said that, my SpecBox runs SS lines for no other reason than everybody does and I'm a lemming. I could not identify any difference in racing conditions.
For some reason I own a 10, a 11 and a 12 mm Flare wrench. I would only have bought them if I needed them. Having done the install the only one I now carry to the track is the 11 required for the bleed nipples.
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