Defeated at GoodGuys

[Snake2998]

On tracks where too much power is a problem why not fit a restriction plate upstream of the carb - won't affect low rev power but will limit open throttle power - nice quick at track mod and you can carry several sizes to try.

A simple solution is an Aluminium band fitted round the air filter with a suitable number of holes drilled in it - you can have several strips with differing hole patterns and sizes - would take seconds to change between runs till you get the right size for the conditions. This assumes your filter assembly can withstand some negative pressure but its much easier than changing mufflers and easy enough to build a filter setub to withstand negative pressure.