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You can get Supertrapp products from Demon Tweeks among others in the UK. Typically the 4 inch disc you would want is about £44 + VAT. Google will direct you to other UK suppliers.
I think the Supertrapp discs will be lucky to reduce noise by more than a couple of dbs - which will not get you even close to the typical 102db UK track day noise limit (measured 1 metre from the tailpipe at 45 degree angle at 3/4 max revs). A std 3.2 is 97-98db and a 2.7RS with single out is 105db. My 3.2 backdated with dual out is louder than 105db and you will be louder again! Just IMHO !
HTH
Richard
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