banjo3006

Sorry if this has already been covered I have searched but I was wanting to know if anybody has some actual performance comparisons on different sprocket ratios.
I am considering change to 15/43 from stock as this seems to be the general consensus but has anybody got 1/4 mile times from stock vs any changes to sprocket ratios they have made to their bike other than just seat of the pants feelings.
I am sure there is a gain to be made as the stock ratio feels to high to me but wanting to know what gains people have got so I know what to expect particularly 1/4 mile but lap times comparisons would also be interesting.
Cheers