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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.
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?