Have run a single 2.5" stainless system for the last 10 years. At the time was give a range of recomendations that a single 2.5" system would give improved running over a twin 2.0" system which is what I had been running (replaced due to being rusted out), also recall reading some articles along those lines at the time...
Single system still sounds good but sometimes think I would have preferred to stick with a twin system with/without a balance pipe - not sure about the merits of a balance pipe? Single system may help if you you are trying to get historic/club rego? Will be interested to hear others thoughts.
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