Ecu ?

I am asking if there is any aftermarket ecu, because I own the 3i and I hate the barier on 118mph, or somewhere around there.
 
120Mph@Unknown Rpms is the limiter...noticed that it gets near it and starts crawling verry slowly to it. my car downshifts to 3 and stays there in both manualmatic and automatic operations. I heard rumors of upgrade pcm's (Mazdaspeed) but those are all rumors from "somewhat" reliable sorces.
 
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