Modest gains at best from a tune alone (i.e., with no mods) is typical.
The only numbers that are easily comparable are dynojet to dynojet numbers -- Mustang dyno #'s cannot be easily compared to each other from shop to shop let alone from one to another dynamometer entirely, but those #'s are probably spot on for a stock Nismo and your gains are solid for tune alone.
Yes, if you add breather or exhaust mods, you will benefit from and/or need a new tune.
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Last edited by Jordo!; 03-29-2015 at 03:46 PM.
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