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I just check madness, they offer several of them, for my Fiat Abarth too. One is even has, adjustable sound. Blow off valves, must be a common mod, for turbo engines.
 

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Discussion Starter · #23 ·
I just check madness, they offer several of them, for my Fiat Abarth too. One is even has, adjustable sound. Blow off valves, must be a common mod, for turbo engines.
Hello Smark,

That is correct, the whoosh/hiss is the added turbo noises from the Blow Off Adaptor Plates.

The blow off adaptors are very popular for turbo vehicles. We've found many enthusiasts like to have the turbo whistle when doing some spirited driving.

We've installed them on our 453s, 500s, Alfas, Jeep Renegade, and Wrangler.

They certainly add some smiles to the drive.
 
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