None! To me anyway. I've listened to about all available on youtube and everything available makes the ecoboost sound like a Honda Civic. It's just not going to sound anything like a V8 so I'm satisfied with the quiet sound of my Platinum Edition....and leaving it that way.
On you tube there is an episode of Gearz with Stacey David where he puts on a Hearthrob exhaust and picks up some nice horsepower and torque gains. He mentioned how the factory exhaust is too restrictive for the twin turbo.
I put on the MBRP i think its one of the best sounding. I looked at a bunch of youtube videos. I know its will never sound like a V8 but I can hear the turbos and it doesnt sound as bad as say a V6 tacoma.
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