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cut outs open up another opening after the headers.
Diverters don't just create another opening they completely shut off the rest of the exhaust system and dump all the exhaust gases after the headers.
Both can be electronically controlled to to open at any percent that you want. You can program both to either open all the way up or only halfway or 3/4 of the way etc...
But since the diverters close off the rest of the exhaust, they act like you are basically running open headers and have a very different exhaust tone from regular cut outs.
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