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It's hard for insulation that was never there in the first place to deteriorate. These are sportscars, not Grand Touring machines and there's going to be a lot of road noise; especially with aggressive tires.
If you're serious about reducing noise, try switching to grad touring all-season tires. You'll give up a good amount of handling and grip, but it will be quieter. The other option would be dynamat, but that can be both expensive and heavy.
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Silver 1998 Volvo S70 T5 <- Daily (Anja)
Guards Red 1986 951 <- Seattle car (Gretchen)
White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei)
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