Nice motor porthos. Is it just me though and please don't take it the wrong way but I might be the only one that prefers without the turbo whistle,i think it masks the rumble of the Monza.Thats just my opinion though and its a lovely looking car 
It is a weird noise and I'm thinking it's the shape of the intake doing it, that could be changed I'm looking into it and will see if it changes the noise. I like it though, but yeah I'd bet you could change the noise with just a Silicone intake hose.
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