Having just fitted pattern Goldies to mine this week (see Exhaust Pipes thread), can definitely say they make a decent noise and have turned me into a throttle-happy teenager all over again. Dunstall Decibel replicas are also very throaty. If you go for something very noisy and with very little back pressure (especially open pipes), it'd be a good idea in my opinion to check the plug colour after your first good run and make any necessary adjustments (ie raise the needle a notch or even go up a size on the main jet). Just to be sure you don't run too weak and end up with exhaust valve or, worse, piston trouble. Good luck! I bought my new silencers purely for the sound - the old system was perfectly OK but just toooooo boring. Groily