16 hp from a tune seems pretty good whats the problem? Go somewhere else and have a dyno run done if you really care about having a sheet with a bigger number on it. Every single dyno will read differently. Some read lower or higher than others. Some unscrupulous shop owners have even been known to change correction factors so their dynos read higher so more people will come their (help inflate their egos I guess). The most important thing is you got an apples to apples comparison before and after on the same dyno.
If you are just worried about if being something wrong with the car (which I doubt), you'll have to get it dynoed elsewhere.
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