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Less restrictions equals higher volume, typically- and things like manifolds can change the character and tone quite a lot. Is it the volume you don't like or the noise itself?
I don't know how much room you have under a MX5 but you may be able to fit additional/larger boxes to absorb some of the volume.
Dammit-
It's the volume I don't like, the tone is nice just a bit too loud. I did contact a local Power Flow center and they said it's always going to be loud due to the "large bore diameter", but adding a silencer could take the edge off for £180.
Being stainless swapping it for a quieter one will most likely be mild steel and cutting into my current one will make it very unattractive if I decide to sell it. There's a trolley jack and axle stand shape object under the tree so may investigate properly soon. Think I need a OE diameter exhaust but in stainless if such a thing exists.
jambon
Is it possible to increase a car's power by changing any part of the exhaust without increasing the loudness?
Basically my catback is too loud for my tastes and if I upgrade the headers or cat to aftermarket parts too things are just going to get louder right?