Think of your neighbours, not just where you live, but anywhere you visit.
There's a guy over the road a few doors down, with a Clio Sport, the real one, not a set of badges and trim.
With the standard exhaust it is a bit of a low drone/throb. Just ticking over, it is irritating, getting it off his drive involves a minute or more of low speed faffing, with revs raised a little. This rattles the windows and really assaults the ears. Not the volume, but the frequency. This morning I was in the shower when he left, so back of the house, electric pumped shower running noisily next to me. Yet I still knew he was moving.
There are many times I would happily throw rocks at him, or in best Top Gear style, drop a piano on it. Lovely car, once it's out of earshot.
His car is standard, so will have passed type approval. If enough of your neighbours are upset with yours, you might get a visit from the police, or local council, armed with noise meters, followed by an enforcement notice. Be nice.
Fiat knew what they were doing. More noise might lose some power as you mess with the gas flow.
(? I . . T . I , .)