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I've heard it said that if it went on exhaust note the Thunderbird should have been called a ***** cat. Drilling out the baffles not only makes the bike sound like it should but also improves performance. There is plenty of info on doing this in various threads on this site, just do a thread search. I drilled mine out with a 20mm (3/4inch) hole saw, fitted a K&N air filter, hot plugs, drilled two 25mm (one inch) holes in the airbox and then replaced both the main (to 120) and pilot (to 40) jets in the carby (you can avoid doing this but you will have to reset the mixture screw to allow more fuel through). I have the mixture screws set at 2 1/2 turns. Apart from some sluggisnesh in cold weather with acceleration before it gets warmed up and a bit of a flat spot around 80kmh it runs like a dream. Just need to get it on a dyno and find out what fine adjustments are needed.
Over all it's worth doing, but research it first - check out what the other riders on this site have to say.
Peter
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