Airbox

[Wout]

Hi to all

I'm looking for an airbox for my 1.7 Type4 engine (dellorto carb's and porsche fan) .
The engine is now to loud for my little son  . I have a normal bus-exhaust (narrowed to fit a beetle) so I think the carb's are making most of the noice  . Correct me if i'm wrong, I'm not an engine specialist like most of you  .

May be someone can help me out?

gr
Wout