[OT] Boom boom sound

[Jeroen Proveniers]

Hai,

Some cars have that typical boom boom sound in the exhaust when the throttle
is released (Alfa Romeo 33 for example); I really like this sound. I do not
know the cause of it, but I want my car to have it. Is there anything I
could make? It's a Ford Sierra with injected 2 litre engine, completely
orginal.

JJ
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