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they are very good. I have a cat back with a mid silencer. Sounds good, very discreet, and keeps me under the 94 dBA noise limit for most circuits. If you go for the same without mid silencer, they are extremely noisy, so you get to choose what you want.
then again, i still am, as nowhere does a 40mm sleeve for the exhaust, so my mate has the back box in his car and is going to try and fabricate something while at work